PR:O54943 mPER2 period circadian protein homolog 2 (mouse) mPER2|circadian clock protein PERIOD 2 (mouse) PR:000000001 NCBITaxon:10090 MGI:MGI:1195265 UniProtKB:O54943 PR:O54943-1 mPER2/iso:1 period circadian protein homolog 2 isoform 1 (mouse) mPER2/iso:1 PR:000000001 NCBITaxon:10090 MGI:MGI:1195265 PR:O54943 UniProtKB:O54943-1