Your Query returns 20 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Pde1bNM_0088001009063kDa    Pde1b1    171891
Pde1bNW_04778510116
PDE1BBC0322269606PDES1B    PDE1B1    171891
PDE1BAY4099959606171891
PDE1BAY4099969598
PDE1BAY40999710090171891
PDE1BNM_0009249606PDE1B1    PDES1B    171891
PDE1BNM_1744159913
PDE1BAH00706610090171891
PDE1BAF02334010090171891
PDE1BAF02334110090171891
PDE1BAF02334210090171891
PDE1BAF02334310090171891
Pde1bNT_03962110090171891
Pde1BAF32790510116
Pde1BAF32790610116
Pde1BAF32790710116
Pde1bBC05853110090Pde1b1    63kDa    171891
Pde1bNM_02271010116Aop2    Pde1b1   
PDE1BNT_0294199606171891

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

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Text2Knowledge ... Yong Huang 2002