Table 2.

Mean plasma norepinephrine and epinephrine levels during development

% IncubationNorepinephrine (ng ml-1)Epinephrine (ng ml-1)
6015±6 (3)14±7 (3)
7027±6 (5)13±8 (5)
8064±17 (5)*21±11 (5)
9080±21 (5)*53±24 (5)
  • An asterisk indicates significant differences (P<0.05) from adjacent periods without asterisks. Due to limited sample size, statistics on catecholamines were omitted for 60% of incubation. All measures are presented as means ± S.E.M. for each percentage of incubation studied. The number of embryos is presented in parentheses