Your Query returns 15 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
PIK3R1AY0629228355
PIK3R1AJ5558269823
PIK3R1AJ5558279823
PIK3R1BC0308159606GRB1    p85-ALPHA    171833
PIK3R1NM_1815049606GRB1    p85-ALPHA    171833
PIK3R1NM_1815239606GRB1    p85-ALPHA    171833
PIK3R1NM_1815249606GRB1    p85-ALPHA    171833
PIK3R1NM_1745759913
Pik3r1NT_03959010090171833
Pik3r1BC02614610090p85alpha    p50alpha    p55alpha    PI3K    171833
Pik3r1BC05110610090p85alpha    p50alpha    p55alpha    PI3K    171833
Pik3r1BC00216810090p85alpha    p50alpha    p55alpha    PI3K    171833
PIK3R1NT_0064319606171833
Pik3r1NM_01108510090PI3K    p50alpha    p55alpha    p85alpha    C530050K14    171833
Pik3r1NM_01300510116PI3KA   

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

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Text2Knowledge ... Yong Huang 2002