Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
pen2AY35165529019
PEN2BC0095759606MDS033    607632
PEN2NM_1723419606MDS033    607632
PEN2NT_0111099606607632
pen2NM_2055767955pen-2   

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

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Text2Knowledge ... Yong Huang 2002