| Nomenclature | RTP Type Q | RTP Type R | RTP Type S | RTP Type T | RTP Type U | RTP Type Z1 |
| HGNC, UniProt | PTPRQ, Q9UMZ3 | PTPRR, Q15256 | PTPRS, Q13332 | PTPRT, O14522 | PTPRU, Q92729 | PTPRZ1, P23471 |
| Putative endogenous ligands | – | – | chondroitin sulphate proteoglycan 3 (NCAN, O14594), netrin‐G3 ligand (LRRC4B, Q9NT99) [94, 165] | – | – | contactin‐1 (CNTN1, Q12860), pleiotrophin (PTN, C9JR52) (acts as a negative regulator) [13, 128] |
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