Your Query returns 8 Accession Numbers:

Query Term	Accession	NCBI Taxonid	Synonyms	Phenotype (OMIM) *
Nppc	NM_010933	10090	CNP	600296
Nppc	NW_047817	10116
NPPC	NM_024409	9606	CNP	600296
NPPC	NM_174125	9913
Nppc	NT_039173	10090		600296
Nppc	U62939	10090		600296
NPPC	NT_005403	9606		600296
Nppc	NM_053750	10116

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

Text2Knowledge ... Yong Huang 2002