Given that FAK plays a role in cell migration and adhesion, it was not necessarily surprising that pericyte FAK deficiency reduced significantly the association of NG2-positive and α-SMA-positive (that were also shown to be Pdgfrβ-positive) pericytes with tumour blood vessels (Fig. 1d, Supplementary Figs. 2 and  3). Here, PDGFRB is linked to neoplasm.