Your Query returns 21 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
ICOSAY3423499615
IcosNM_01748010090H4    AILIM    Ly115    604558
ICOSAF4110589606604558
ICOSAF4110599606604558
ICOSAH0115689606604558
ICOSAF4883469606604558
ICOSAF4883479606604558
ICOSBC0280069606AILIM    MGC39850    604558
ICOSBC0282109606AILIM    MGC39850    604558
ICOSAJ2778329606604558
ICOSAJ5357189606604558
ICOSNM_0120929606AILIM    MGC39850    604558
IcosNT_03917010090604558
IcosNT_03919910090604558
IcosAH01021710090604558
IcosAF32718410090604558
IcosAF32718510090604558
ICOSAJ25055910090604558
IcosBC03485210090Ly115    H4    AILIM    604558
ICOSAF21831232630
ICOSNT_0054039606604558

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

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Text2Knowledge ... Yong Huang 2002