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. Author manuscript; available in PMC: 2014 Mar 25.
Published in final edited form as: J Biol Rhythms. 2009 Dec;24(6):509–522. doi: 10.1177/0748730409349714

Figure 4.

Figure 4

Mean ± SEM delayed-type hypersensitivity (DTH) responses (percent increases in pinna thickness, compared to baseline) during the week after antigen (DNFB) challenge of Siberian hamsters raised in (A) 15L or (B) 9L and transferred to 1 of 7 different experimental photoperiods. Note nonlinearity of x-axis. Bar plots illustrate statistical comparisons of DTH magnitude (C) on the first day postchallenge (day +1) and (D) on the day of the peak DTH response (day +2) in each of the 7 experimental photoperiods (indicated along the abscissa). In panels A and B: *p < 0.05 vs. 15L→15L group (repeated-measures ANOVA). In panels C and D: #p < 0.05 vs. 9L→9L value. +p < 0.05 vs. 15L→15L value.