Phytohemagglutinin (PHA-M) is a lectin extracted from red kidney bean Phaseolus vulgaris. PHA-M is the most common mitogen used for the stimulation of cell division in lymphocyte cultures. PHA-M is a mucoprotein consisting of two subunits, a leucoagglutinin (PHA-L) and an erythroagglutinin (PHA-E). Leucoagglutinin is responsible for mitogenic property of PHA-M as it has high affinity for lymphocyte surface receptors. TCL071 is a sterile filtered solution of 1mg per ml PHAM in sterile tissue culture water.