That was in 1918, but it took another 11 years before the mould’s magic killer...

Question

That was in 1918, but it took another 11 years before the mould’s magic killer ingredient, penicillin, (5)__________ . (find)
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Answer 1

That was in 1918, but it took another 11 years before the mould’s magic killer ingredient, penicillin, was found.