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In vitro lymphocyte proliferation responses of adult female tree swallows as a function of age (n=43 in all cases). (a) Lymphocyte proliferation in response to PHA (PHA SI; r=−0.503, p=0.001, regression line: log y=−0.112 log x+1.9), (b) lymphocyte proliferation in response to ConA (ConA SI; r=−0.422, p=0.005, regression line: log y=−0.121 log x+1.0), (c) lymphocyte proliferation in response to LPS (LPS SI; r=−0.079, p=0.613).
