[Activation of the synthesis of RNA in lymphocytes following irradiation by a He-Ne-laser].

The rate of 14C-uridine incorporation during the first 12 hours after exposure of human peripheral blood lymphocytes to He-Ne laser radiation (lambda = 632.8 nm, D = 56 J/m2) has been determined. The stimulation of RNA synthesis is maximum 2 and 4 h following irradiation. The same regularity is noted after the addition of phytohemagglutinin (PHA). In 7 h the rate of RNA synthesis in irradiated cells is at the control level whereas in PHA stimulated cells the rate of 14C-uridine considerably increases.