Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Ccl21aNT_03926010090
Ccl21aNM_01133510090SLC    CKb9    TCA4    6Ckine    Scya21    6CKBAC1    Scya21a   

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

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Text2Knowledge ... Yong Huang 2002