Your Query returns 24 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
grb2AJ2230618355
Grb2NM_00816310090Ash    108355
Grb2NW_04734310116
GRB2AH0069779606108355
GRB2AF0636149606108355
GRB2AF0636159606108355
GRB2AF0636169606108355
GRB2AF0636179606108355
GRB2AF0636189606108355
GRB2AY4132179606108355
GRB2AY4132189598
GRB2AY41321910090108355
GRB2AF4989259606108355
grb2U0761710090108355
Grb2NT_03952110090108355
Grb2BC05237710090Ash    108355
GRB2L192589031
Grb2U897758355
GRB2BC0006319606108355
GRB2NT_0106419606108355
Grb2NM_03084610116
GRB2NM_0020869606ASH    Grb3-3    EGFRBP-GRB2    108355
GRB2NM_2035069606ASH    Grb3-3    EGFRBP-GRB2    108355
GRB2NM_2044119031

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

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Text2Knowledge ... Yong Huang 2002