diff --git a/src/propeller/genome.cljc b/src/propeller/genome.cljc
index 6f29bb6..d61bcc7 100755
--- a/src/propeller/genome.cljc
+++ b/src/propeller/genome.cljc
@@ -48,9 +48,8 @@ They hold the genetic material for an `individual`. In the initial population, w
    (plushy->push plushy {}))
   ;; call plushy->push-internal with possibly-preprocessed plushy
   ([plushy argmap]
-   (plushy->push-internal (if (or (> (or (:ah-umad (:variation argmap)) 0) 0) ;; must strip :vary and :protect
-                                  (> (or (:bmx (:variation argmap)) 0) 0) ;; must strip :gene
+   (plushy->push-internal (if (or (> (or (:bmx (:variation argmap)) 0) 0) ;; must strip :gene
                                   (> (or (:bmx-umad (:variation argmap)) 0) 0)) ;; must strip :gene
-                            (filter (complement #{:vary :protect :gene}) plushy)
+                            (filter (complement #{:gene}) plushy)
                             plushy)
                           argmap)))
\ No newline at end of file
diff --git a/src/propeller/gp.cljc b/src/propeller/gp.cljc
index e25644c..86c7be3 100644
--- a/src/propeller/gp.cljc
+++ b/src/propeller/gp.cljc
@@ -185,15 +185,6 @@
             (if (or (and prob-bmx (> prob-bmx 0))
                     (and prob-bmx-umad (> prob-bmx-umad 0)))
               (update args :instructions concat (repeat (or n 1) :gene))
-              args)))
-        ;
-        adjust-for-ah-umad
-        (fn [args]
-          (let [prob (:ah-umad (:variation args))
-                n (:ah-umad-enrichment args)]
-            (if (and prob (> prob 0))
-              (update args :instructions concat (flatten (repeat (or n 1) [:vary :protect])))
               args)))]
     (gp-loop (-> argmap
-                 (adjust-for-bmx)
-                 (adjust-for-ah-umad)))))
\ No newline at end of file
+                 (adjust-for-bmx)))))
diff --git a/src/propeller/problems/boolean/mul3.cljc b/src/propeller/problems/boolean/mul3.cljc
index 2ca3353..5ac2216 100644
--- a/src/propeller/problems/boolean/mul3.cljc
+++ b/src/propeller/problems/boolean/mul3.cljc
@@ -307,11 +307,7 @@
      :ds-function              :case-rand
      :downsample-rate          0.1
      :umad-rate                0.01
-     :ah-umad-min              0.001
-     :ah-umad-max              0.5
-     :ah-umad-mean             0.01
-     :variation                {:ah-umad 0
-                                :umad 0
+     :variation                {:umad 0
                                 :bmx 0
                                 :bmx-umad 1}
      :single-thread-mode       false
diff --git a/src/propeller/variation.cljc b/src/propeller/variation.cljc
index f4a92a8..a380c92 100644
--- a/src/propeller/variation.cljc
+++ b/src/propeller/variation.cljc
@@ -134,85 +134,6 @@ The function `new-individual` returns a new individual produced by selection and
                        (/ 1 (+ 1 (/ 1 umad-rate)))))
             plushy)))
 
-(defn ah-normalize
-  "A utility for autoconstructive hypervariability mutation. 
-   Takes a vector of :protect and :vary and returns a numeric vector
-   that conforms to the specified min, max, and mean."
-  [v ah-min ah-max ah-mean]
-  (let [c (count v)
-        protect-count (count (filter #(= % :protected) v))
-        vary-count (- c protect-count)
-        extremes (mapv #(if (= % :protect) ah-min ah-max) v)
-        mean-of-extremes (/ (reduce + extremes) (count extremes))]
-    (cond
-      ;; all :vary or all :protect, return all ah-mean
-      (or (zero? protect-count) (zero? vary-count))
-      (repeat (count v) ah-mean)
-      ;; mean is too high, lower high values from max
-      (> mean-of-extremes ah-mean)
-      (let [lowered (/ (- (* ah-mean c)
-                          (* ah-min protect-count))
-                       vary-count)]
-        (mapv #(if (= % ah-max) lowered %) extremes))
-      ;; mean is too low, raise low values from min
-      (> mean-of-extremes ah-mean)
-      (let [raised (/ (- (* ah-mean c)
-                         (* ah-max vary-count))
-                      protect-count)]
-        (mapv #(if (= % ah-min) raised %) extremes))
-      ;; mean is just right, return extremes
-      :else
-      extremes)))
-
-(defn ah-rates
-  "A utility for autoconstructive hypervariability mutation. 
-   Returns the sequence of rates with which each element of plushy should
-   be mutated when using autoconstructive hypervariability."
-  [plushy ah-min ah-max ah-mean]
-  (loop [i 0
-         protected true
-         rates []
-         remainder plushy]
-    (if (empty? remainder)
-      (ah-normalize rates ah-min ah-max ah-mean)
-      (if (and (not protected)
-               (= (first remainder) :protect))
-        (recur (inc i)
-               true
-               (conj rates 1)
-               (rest remainder))
-        (recur (inc i)
-               (if protected
-                 (not= (first remainder) :vary)
-                 false)
-               (conj rates (if protected :protect :vary))
-               (rest remainder))))))
-
-(defn ah-uniform-addition
-  "Returns plushy with new instructions possibly added before or after each
-  existing instruction. Rates are autoconstructively hypervariable."
-  [plushy instructions ah-min ah-max ah-mean]
-  (apply concat
-         (mapv #(if (< (rand) %2)
-                  (shuffle [%1 (utils/random-instruction instructions)])
-                  [%1])
-               plushy
-               (ah-rates plushy ah-min ah-max ah-mean))))
-
-(defn ah-uniform-deletion
-  "Randomly deletes instructions from plushy at some rate.
-   Rates are autoconstructively hypervariable."
-  [plushy ah-min ah-max ah-mean]
-  (mapv first
-        (remove (fn [[_ rate]]
-                  (< (rand)
-                     (if (zero? rate)
-                       0
-                       (/ 1 (+ 1 (/ 1 rate))))))
-                (mapv vector
-                      plushy
-                      (ah-rates plushy ah-min ah-max ah-mean)))))
-
 (defn bmx
   "Crosses over two plushies using best match crossover (bmx)."
   [plushy-a plushy-b rate]
@@ -290,15 +211,6 @@ The function `new-individual` returns a new individual produced by selection and
            (-> (:plushy (selection/select-parent pop argmap))
                (uniform-addition (:instructions argmap) rate)
                (uniform-deletion rate)))
-       ;
-         :ah-umad ;; autoconstructive hypervariability UMAD
-         (let [ah-min (utils/onenum (:ah-umad-min argmap))
-               ah-max (utils/onenum (:ah-umad-max argmap))
-               ah-mean (utils/onenum (:ah-umad-mean argmap))
-               parent-genome (:plushy (selection/select-parent pop argmap))]
-           (-> parent-genome
-               (ah-uniform-addition (:instructions argmap) ah-min ah-max ah-mean)
-               (ah-uniform-deletion ah-min ah-max ah-mean)))
        ;
          :uniform-addition
          (-> (:plushy (selection/select-parent pop argmap))