FGF21 and type 2 diabetes mellitus: The results showed that blood perfusion in the ischaemic hind limbs of the FGF21‐treated mice was obviously higher than that of the PBS‐treated mice since day 7 post‐HLI surgery (Figure 1A,B), indicating that FGF21 can improve blood perfusion in ischaemic hind limbs under T2DM conditions.