irradiating {HEAD ~ the mixture} of {TAIL ~ leukocytes} in the presence of a psoralen at a temperature between about 20° C. and about 28° C.; followed by 
of
irradiating { HEAD ~ the mixture } of { TAIL ~ leukocytes } in the presence of a psoralen at a temperature between about 20 ° C. and about 28 ° C. ; followed by
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH