Your Query returns 2 Accession Numbers:

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Query Term	Accession	NCBI Taxonid	Synonyms	Phenotype (OMIM) *
U1a-21D	NR_001599	7227	K5    U1    U14    U1a    dU1    U1-1    snRNA1    CR31656    U1-21.1    U1snRNA    snRNA:U1    U1snRNA21D    snRNA:U1:21D
U1a-21D	NT_033779	7227	K5    U1    U14    U1a    dU1    U1-1    snRNA1    CR31656    U1-21.1    U1snRNA    snRNA:U1    U1snRNA21D    snRNA:U1:21D

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

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Text2Knowledge ... Yong Huang 2002