Expression stability of the reference genes according to Reid et al (2006) . Cq values of the reference genes ACT, EF1 and UBQ are shown over all treatments separately for each clone. Boxes represent 25 and 75 quartiles, Whisker caps indicate 10 and 90 percentiles, and medians are shown by the line. Standard deviations of the Cq values are given separately for each clone. ACT, actin; EF1, elongation factor 1; UBQ, ubiquitin; n = 9.