Total plasmin activity in soluble and/or membrane fractions of homogenates of hippocampal tissue from animals injected with NBH, ME7, LPS, KA, or saline. (a) Soluble fractions of NBH and ME7 (13, 18, and 21 weeks). (b) Membrane fractions of NBH and ME7 (13, 18, and 21 weeks). (c) Soluble fractions of KA (24 and 72 h) and saline-injected (24 h). (d) Soluble fractions of LPS (8 and 72 h) and saline-injected animals (8 h). Data represent the mean for n = 4 in each experimental group. Error bars have been omitted for clarity, owing to the frequency of sampling.