Correction:Spontaneous mutations and mutational responses to penicillin treatment in the bacterial pathogen Streptococcus pneumoniae D39

Due to technical errors,Ho-Ching T.Tsui and Malcolm E.Winkler,both collaborators who made substantial contributions to this work and were previously acknowledged,did not receive emails regarding authorship consent and were inadvertently omitted from the author list.We have now rectified this oversight and added them to the author list.