A, Northern-blot analysis of the equistatin transcript expressed in potato cv Desirée transformed with pLhca.3.St1/EIM construct. Numbers represent the hours of the day, and black and white shading represents the dark and the light part of the photoperiod. +, Positive control mRNA used in the experiment. B, Western-blot analysis of the equistatin protein accumulated in potato cv Desirée transformed with pLhca.3.St1/EIM construct. Numbers represent the hours of the day, and black and white shading represents the dark and the light part of the photoperiod. +, Positive control protein, produced in Escherichia coli and used in the experiment.