Your Query returns 17 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Serpina1aNM_00924310090PI1    Spi1-1    Spi1-3   
Serpina1aNM_00924510090PI1    Spi1-1    Spi1-3   
Serpina1aNT_03955210090
Serpina1aBC01098810090PI1    Spi1-3   
Serpina1aBC01526610090PI1    Spi1-3   
Serpina1aBC01104110090PI1    Spi1-3   
Serpina1aBC00981810090PI1    Spi1-3   
Serpina1aBC03170710090PI1    Spi1-3   
Serpina1aBC02178010090PI1    Spi1-3   
Serpina1aBC02132510090PI1    Spi1-3   
Serpina1aBC05798910090PI1    Spi1-3   
Serpina1aBC02410810090PI1    Spi1-3   
Serpina1aBC01098410090PI1    Spi1-3   
Serpina1aBC03700710090PI1    Spi1-3   
Serpina1aBC05798410090PI1    Spi1-3   
Serpina1aBC05798210090PI1    Spi1-3   
Serpina1aBC01104010090PI1    Spi1-3   

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

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Text2Knowledge ... Yong Huang 2002