purified vaccinia virus , which had been grown on chick-embryo chorioallantoic membranes in the presence or in the absence of 5-iodo-2'-deoxyuridine ( iudr ) , was suspended in 5 m ammonium acetate and subjected to the one-step kleinschmidt procedure on surfaces of distilled water or salt solutions .
C0011535
deoxyuridine
C0020811
iudr