The teratogenic effect of thalidomide (Th) is well-known. Current theories about the mechanism of action of this effect have been well summarized by Woollam (21), There is controversy about the possible immunosuppressive action of this compound (1 , 2,4,5, 10) and its influence on chromosome aberrations (9. 14. 15). It seems clear, however, that the drug does not have an all-inclusive "blanket"...