Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Serpinb9fNM_01145510090NK21    Spi13    NK21L1    ovalbumin    1600002F03Rik   
Serpinb9fNT_03957910090
Serpinb9fBC064758100901600002F03Rik    NK21L1    ovalbumin    NK21   
Serpinb9fBC064759100901600002F03Rik    NK21L1    ovalbumin    NK21   

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

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Text2Knowledge ... Yong Huang 2002