Your Query returns 20 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Ptpn1NM_01120110090PTP1B    PTP-1B    176885
PTPN1M336899606176885
PTPN1AH0029429606176885
PTPN1M336889606176885
PTPN1M336879606176885
PTPN1M336869606176885
PTPN1M336859606176885
PTPN1M336849606176885
PTPN1M317249606176885
Ptpn1NW_04766010116
Ptpn1NM_01263710116Ptp   
PTPN1BC0156609606PTP1B    176885
PTPN1BC0181649606PTP1B    176885
PTPN1AL1332309606176885
PTPN1AL0344299606176885
PTPN1NM_0028279606PTP1B    176885
Ptpn1NT_03921010090176885
Ptpn1BC00572910090PTP-1B    PTP1B    176885
Ptpn1BC01019110090PTP-1B    PTP1B    176885
PTPN1NT_0113629606176885

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

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Text2Knowledge ... Yong Huang 2002