title: A possible two-photon effect in vitro using a focused laser beam.
abstract: A probable two-photon effect is described as a result of focusing an intense pulsed laser beam onto chromosomes of living cells. The effect was suggested after the derivation of a two-photon action spectrum and the demonstration of a lack of reciprocity.
mesh_terms: D002460:Cell Line; D002875:Chromosomes; D004601:Elementary Particles; D007834:Lasers