Also, while Figure 5 indicates that the phu-wt allele has a growth advantage in 5uM, Appendix 1—figure 7 shows that all the statistically significant (or marginally significant) effects in specific pairs, go on the other direction – phu+ grow better than phu-wt.
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The sentences
Limited diffusion of secreted pyoverdine, as is likely in viscous CF sputum, impairs the ability of potential cheats to exploit and may contribute to stabilize cooperation in these lineages ( Julou et al., 2013 ; Kummerli et al., 2009 ); although there may be significant exchange between spatially distinct microcolonies ( Weigert and Kümmerli, 2017 ).