Peptide sequence: TTLSKSLAGA AKHERKAAKT LGIAVGIYLL CWLPFTIDTM VDSLLHFITP Sequence homology: Cow: 93%; Dog: 93%; Guinea Pig: 93%; Horse: 93%; Human: 100%; Mouse: 91%; Rabbit: 91%; Rat: 100%. The photoreceptor-specific nuclear receptor (PNR) is a recently