arf6–jip3/4 regulate endosomal tubules for mt1-mmp exocytosis proximal tubules have the capacity to regulate uptake of albumin arf6–jip3/4 regulate endosomal tubules for mt1-mmp exocytosis bin1 induces the formation of t‐tubules and adult‐like ca enhanced ammonia secretion by proximal tubules from mice