Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
ribosomal protein S21AB0071579606
ribosomal protein S21AB0071579606
ribosomal protein S21AB0071579606
Ribosomal protein S21NM_0787387227RpS21    oho23    CG2986    l(2)03575    l(2)168/14    l(2)k16814    overgrown hematopoietic organs-23    oho23B   

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

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Text2Knowledge ... Yong Huang 2002