Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Pde1b1NM_0088001009063kDa    Pde1b    171891
PDE1B1BC0322269606PDES1B    PDE1B    171891
PDE1B1NM_0009249606PDES1B    PDE1B    171891
Pde1b1BC0585311009063kDa    Pde1b    171891
Pde1b1NM_02271010116Aop2    Pde1b   

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002