Ror

ROR1 and ROR2 define the Ror branch of receptor tyrosine kinases, distinguished by an extracellular array of a cysteine-rich Wnt-binding Frizzled domain, two immunoglobulin-like domains, and a kringle domain. Acting as Wnt5a receptors, they drive non-canonical planar cell polarity, calcium, and Rho-GTPase signaling that governs limb, craniofacial, cardiac, and skeletal development; ROR2 loss-of-function causes Robinow syndrome, and ROR1 variants are linked to brachydactyly type B2. On malignant B cells and many solid tumors, ROR1 reappears as a pro-survival and migration receptor, fueling CAR-T, bispecific, and antibody-drug conjugate programs. Recombinant Ror ectodomains support Wnt-binding studies.