of thse studies were made usiny pretreatment serum in the culture wi . 1) mad e Seat ad te . - . wessA eho 4 be , tle cells that had bern collected at various intervals aftor the P-1T hud It can Le comelitted that the dose of 1317 commonly used to trest Grav t does cause chromusaial aberration: such es dicentric: and rinc ‘ors, so result of the radiation and not attributaebie artifacts. it is antici Isa ft dae * oe ee + hie tied fale this work will be published. “vN ean snmae 1 ee