The microarray experiment compare the transcriptome of PV-4 wild type versus the deltahemH1 mutant, a PPIX accumulating strain. Only part of the data is used in the manuscript and we are working on this dataset for future manuscripts Overall design: The wild type and deltahemH1 cell were revived and then cultured into late log-phase for collection, when significant PPIX accumulation occurred. Three biological replicates for wild type and deltahemH1