1505954 PWM pokeweed mitogen 1672 1457843 PMW pokeweed mitogen 3 1505881 PWN pokeweed mitogen 3 1445844 PKW pokeweed mitogen 1 376320 PW pokeweed mitogen 1 3331665 PWEM pokeweed mitogen 1 3332207 PWM-G pokeweed mitogen 1