Figure 1From: Analysis of variation of amplitudes in cell cycle gene expressionLog2 expression ratio for PCNA, a known G1/S phase gene, in thymidine-thymidine (exp2) arrest and thymidine-nocodazole arrest (exp4) studies. The solid line ('__') is the fit, which is estimated from the random-periods model (1), to the data ('o') from Whitfield et al. (2002).Back to article page