Your Query returns 7 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CO4BC0123729606C4S    C4A   
CO4NM_0005929606C4F    C4B   
CO4NM_0072939606C4S    C4A   
CO4NT_0075929606C4F    C4B   
CO4NG_0000139606C4F    C4B   
CO4AF490474112509
CO4AF490475112509

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

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Text2Knowledge ... Yong Huang 2002