Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
p38betaNM_01116110090P38b    Sapk2    p38-2    Prkm11    Sapk2b    p38beta2    Mapk11   
p38BetaBC0279339606PRKM11    P38BETA2    P38B    SAPK2B    SAPK2    p38-2    MAPK11   
p38BetaNM_0027519606P38B    SAPK2    p38-2    PRKM11    SAPK2B    P38BETA2    MAPK11   
p38BetaNM_1389939606P38B    SAPK2    p38-2    PRKM11    SAPK2B    P38BETA2    MAPK11   
p38betaBC05721110090P38b    Sapk2    p38-2    Sapk2b    p38beta2    Mapk11   
p38betaBC06473710090P38b    Sapk2    p38-2    Sapk2b    p38beta2    Mapk11   

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

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Text2Knowledge ... Yong Huang 2002