The mouse named Hammer toe which appeared over a half century ago picked the attention of research for his toe morphology (with interdigital webbing) which is different from the toe commonly known of mouse . The researchers revealed that this novel toe morphology is due to the alteration of regulation information for genes. This finding might serve as evidence for the parallel evolution as the genes expressed in this mouse have been also activated in other animals such as bats (webbed wing).
For more information, here is the link:
https://www.technologynetworks.com/genomics/news/hammer-toe-mice-genes-highlight-evolutionary-adaptations
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