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Northern blots of RNA extracted from parental and helper virus-infected cells. RNA was obtained from K1735-puro/neo cells, parental K1735 cells, helper virus-infected NIH 3T3 cells, and parental NIH 3T3 cells. Northern blots of the RNA were probed with 4070A env (top panel). The blot was stripped and probed with neo (middle panel) and then, as a control, probed with the gene for murine glyceraldehyde-3-phosphate dehydrogenase (G3PDH) (bottom panel).
