Human Hox genes are in four clusters: HOXA, HOXB, HOXC, and HOXD, for a total of 39 genes. Besides conserving the clustering of genes, evolution has also conserved________ .
A) their chromosomal locations
B) the order of the genes within the clusters
C) their bilateral symmetry
D) their expression along the dorsal- ventral axis
E) the number of HOX genes
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