Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
GRB1BC0308159606p85-ALPHA    PIK3R1    171833
GRB1NM_1815049606p85-ALPHA    PIK3R1    171833
GRB1NM_1815239606p85-ALPHA    PIK3R1    171833
GRB1NM_1815249606p85-ALPHA    PIK3R1    171833

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

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Text2Knowledge ... Yong Huang 2002