Your Query returns 21 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
catalaseU001457227
catalaseU001457227
catalaseU001457227
catalaseX040919606
catalaseM6289710090
catalaseNM_0804837227CAT    CATA    CATHPO    CG6871    U00145    DMCATHPO    DROCATHPO    l(3)neo26    bs36h11.y1   
catalaseNT_0374367227CAT    CATA    CATHPO    CG6871    U00145    DMCATHPO    DROCATHPO    l(3)neo26    bs36h11.y1   
catalaseX743677227
catalaseAH00496710116
catalaseM2566910116
catalaseM2567010116
catalaseM2567110116
catalaseM2567210116
catalaseM2567310116
catalaseM2567410116
catalaseM2567510116
catalaseM2567610116
catalaseM2567710116
catalaseM2567810116
catalaseM2567910116
catalaseM2568010116

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

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Text2Knowledge ... Yong Huang 2002