Inhibition of lynphocyte activation by extracts and fractions of Kalanchoe, Alternanthera, Paullinia and Mikania species - Moraes, VLGS L; Castro, S B; Loureiro, L H; Lima, O A; Souza, MLM; Yien, LMK; Rossi-Bergmann, B; Costa, S S (Phytomedicine, 1994)