Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CCL21BC0279189606SLC    MGC34555    TCA4    SCYA21    CKb9    602737
CCL21NM_0029899606SLC    CKb9    TCA4    SCYA21    MGC34555    602737
CCL21NT_0084139606602737

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

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Text2Knowledge ... Yong Huang 2002