Fig. 2. The 27-kDa and ZSF4C1 zein mRNA relative steady-state levels in endosperm after 0 (ct), 2 (2d), or 4 (4d) days of heat stress (DHS) treatments. (A) 27-kDa zein levels normalized relative to 18S rRNA. (B) ZSF4C1 zein levels normalized relative to 18S rRNA. Comparison of means was done by LSD; a and b indicate statistically different values at 5% (*) and 1% (**) levels of significance.