In absence of infection (NI, Fig. 3c–g), the mmp7+ population was only significantly different at the injury site for Tail– animals, as seen with the earlier myeloid spiba+ cells, with an increased number of mmp7+ cells accumulated in the bud tail or amputation plane respect to Ctrl embryos (one-way ANOVA P < 0.01; Bonferroni’s posttest P < 0.0001; Fig. 3d). This evidence concerns the gene MMP7 and infection.