Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
ADTB3ABC0384449606ADTB3    HPS    HPS2    AP3B1    603401
ADTB3ANM_0036649606PE    HPS    HPS2    ADTB3    AP3B1    603401

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

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Text2Knowledge ... Yong Huang 2002