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Time line of cell line derivations (left to the time bar) and key developments (right side) referred to in the text. YFV 17D, yellow fever virus 17D strain; CEF, chicken embryo fibroblasts; AFEB, American Forces Epidemiological Board; PMKC, primary monkey kidney cell; IPV and OPV, inactivated and oral polio vaccine, respectively; HAdV, human adenovirus; MVA, modified vaccinia virus Ankara.
