= Peromyscus
{c}
<Peromyscus> is a genus of primarily New World <rodents>, including animals commonly called <deer> mice. It is distinct from the genus of the house mouse and has become useful for studying variation in ecology, behaviour and reproduction among related <species>.
Crosses between two <Peromyscus> <species> produced growth differences depending on which <species> supplied the mother and father. Analysis found disruption of <genomic imprinting> in the <hybrids>, while imprinting remained present in the tested parental <species>. <Genomic imprinting is disrupted in interspecific Peromyscus hybrids by Paul B. Vrana and others>[1998, abstract: reciprocal species crosses, growth effects and disrupted hybrid imprinting]{ref} The result distinguishes a <hybrid> regulatory mismatch from complete absence of the mechanism in one parent. Swapping the direction of a cross can expose parent-of-origin effects hidden by a single pooled <hybrid> category.
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