Figure 1From: Variation in nocturnality and circadian activity rhythms between photoresponsive F344 and nonphotoresponsive Sprague Dawley rats Representative actograms of F344 and HSD rats. (a) F344 rat in LD, (b) HSD rat in LD, (c) F344 rat in SD, (d) HSD rat in SD, (e) F344 rat in DD, (f), HSD rat in DD, (g) arrhythmic HSD rat in DD.Back to article page