Your Query returns 9 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Rps6ka4NM_01992410090Msk2    90kDa    mMSK2    1110069D02Rik   
RPS6KA4BC0478969606RSK-B    MSK2    RSKB   
RPS6KA4AY4113099606
RPS6KA4AY4113109598
RPS6KA4AY41131110090
RPS6KA4NM_0039429606MSK2    RSKB    RSK-B   
Rps6ka4NT_03968710090
Rps6ka4BC01296410090Msk2    mMSK2    90kDa   
RPS6KA4NT_0339039606

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

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Text2Knowledge ... Yong Huang 2002