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Daily changes in esgal1 expression with variation in light-organ symbiont growth rate. esgal1 expression in wild-caught adult (A) and juvenile (B) light organs during periods of slow and rapid bacterial growth, approximately 12-14 h before dawn and 2 h after dawn, respectively. All data are normalized to the condition of lowest expression. Error bars denote the standard error of the mean. * = p<0.05 and ** = p<0.01 by an unpaired t-test after log transformation to ensure normality.
