Time course changes in plasma leucine of rats fed either a 4-gram meal containing 20% energy from either whey protein isolate (), soy protein isolate (), Blend 1 () or Blend 2 (). Data are means ± SEM; n=5-6 animals/time point. *P<0.05, WP vs all other groups at 45 min. +P<0.05, WP vs SP at 90 min but not significantly different from either Blend 1 or Blend 2. #P<0.05, WP vs SP alone at 135 min but not significantly different from either Blend 1 or Blend 2. Where there are no symbols, there is no significant difference between any groups at any given time point.