diff --git a/src/propeller/genome.cljc b/src/propeller/genome.cljc
index d61bcc7..cb18903 100755
--- a/src/propeller/genome.cljc
+++ b/src/propeller/genome.cljc
@@ -48,8 +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 (:bmx (:variation argmap)) 0) 0) ;; must strip :gene
-                                  (> (or (:bmx-umad (:variation argmap)) 0) 0)) ;; must strip :gene
-                            (filter (complement #{:gene}) plushy)
+   (plushy->push-internal (if (or (> (or (:bmx (:variation argmap)) 0) 0) ;; must strip :gap
+                                  (> (or (:bmx-umad (:variation argmap)) 0) 0)) ;; must strip :gap
+                            (filter (complement #{:gap}) plushy)
                             plushy)
                           argmap)))
\ No newline at end of file
diff --git a/src/propeller/gp.cljc b/src/propeller/gp.cljc
index 86c7be3..d133088 100644
--- a/src/propeller/gp.cljc
+++ b/src/propeller/gp.cljc
@@ -184,7 +184,7 @@
                 n (:bmx-enrichment args)]
             (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))
+              (update args :instructions concat (repeat (or n 1) :gap))
               args)))]
     (gp-loop (-> argmap
                  (adjust-for-bmx)))))
diff --git a/src/propeller/utils.cljc b/src/propeller/utils.cljc
index 27aa193..0f1ecc2 100755
--- a/src/propeller/utils.cljc
+++ b/src/propeller/utils.cljc
@@ -165,13 +165,13 @@
 
 (defn count-genes
   "A utility for best match crossover (bmx). Returns the number of segments 
-   between (and before and after) instances of :gene."
+   between (and before and after) instances of :gap."
   [plushy]
-  (inc (count (filter #(= % :gene) plushy))))
+  (inc (count (filter #(= % :gap) plushy))))
 
 (defn extract-genes
   "A utility for best match crossover (bmx). Returns the segments of the plushy
-   before/between/after instances of :gene."
+   before/between/after instances of :gap."
   [plushy]
   (loop [genes []
          current-gene []
@@ -179,7 +179,7 @@
     (cond (empty? remainder)
           (conj genes current-gene)
           ;
-          (= (first remainder) :gene)
+          (= (first remainder) :gap)
           (recur (conj genes current-gene)
                  []
                  (rest remainder))
diff --git a/src/propeller/variation.cljc b/src/propeller/variation.cljc
index a380c92..d575e27 100644
--- a/src/propeller/variation.cljc
+++ b/src/propeller/variation.cljc
@@ -139,7 +139,7 @@ The function `new-individual` returns a new individual produced by selection and
   [plushy-a plushy-b rate]
   (let [a-genes (utils/extract-genes plushy-a)
         b-genes (utils/extract-genes plushy-b)]
-    (flatten (interpose :gene
+    (flatten (interpose :gap
                         (mapv (fn [g]
                                 (if (< (rand) rate)
                                   (apply min-key #(metrics/levenshtein-distance g %) b-genes)