Fig. 1. Mean (±SEM) monthly serum concentrations of immunoreactive relaxin with results of statistical analysis throughout a 12-month gestation period and early post-partum relative to parturition (Month 0) in bottlenose dolphins with live births (34 dolphins involving 60 pregnancies). Different super-scripts among means (a, b, c, d, e) indicate statistical changes (P < 0.05) among months. Values in parentheses on the x-axis represent the number of observations used to calculate the means.