Your Query returns 10 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
OPRL1AY2684289606
OPRL1BC0384339606ORL1    NOCIR    KOR-3    MGC34578    OOR   
OPRL1AL5905489606
OPRL1AL1215819606
OPRL1AY4107459606
OPRL1AY4107469598
OPRL1AY41074710090
OPRL1NM_1826479606OOR    ORL1    KOR-3    NOCIR    MGC34578   
OPRL1NM_0009139606OOR    ORL1    KOR-3    NOCIR    MGC34578   
OPRL1NT_0113339606

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

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Text2Knowledge ... Yong Huang 2002