Your Query returns 11 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
gpt2AL0313494896SPBC15D4.04    gpt   
GPT2BC0625559606ALT2    607438
GPT2AY4112139606607438
GPT2AY4112149598
GPT2AY41121510090607438
GPT2AY0291739606607438
GPT2NM_1334439606ALT2    607438
GPT2BC0619557955
GPT2NT_0353639606607438
GPT2BC0665437955
GPT20N/AGAT1   

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

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Text2Knowledge ... Yong Huang 2002