Your Query returns 12 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Ripk2NM_13895210090CCK    RICK    RIP2    CARD3    CARDIAK   
ripk2NM_1944117955RICK   
RIPK2BC0045539606RICK    RIP2    CARDIAK    CARD3   
RIPK2AY4155279606
RIPK2AY4155289598
RIPK2AY41552910090
RIPK2NM_0038219606RICK    RIP2    CARD3    CARDIAK   
Ripk2NT_03925810090
Ripk2AF48753910090Rick   
RIPK2AY33564532630
RIPK2NT_0080469606
RIPK2AY5629969606

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

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Text2Knowledge ... Yong Huang 2002