Photomicrographs of hamster SCN sections immunostained with PER1 antibodies. LeSauterJoseph M. LambertChristopher R. RobothamMargaret ModelZina SilverRae R. WeaverDavid 2013 <p>PER1 antibodies R1177, R43 and GP91 were used at a concentration of 1∶5,000. Animals were euthanized at ZT12. Scale bar, 100 µm.</p>