at low furocoumarin doses and short times of uv-a irradiation ( 15-30 sec ) used in the present study , 3-cps did not affect 3h-tdr incorporation in pha-stimulated human lymphocytes , tma strongly inhibited 3h-tdr incorporation , while , unexpectedly , psr increased 3h-tdr incorporation in the absence of irradiation , likely acting , under these experimental conditions , as a co-mitogen .
C0016859
furocoumarin
C0016072
psr