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| Compound class: 
                                                            Endogenous peptide in human, mouse or rat
                                 
                                    Species: Human
                                 | 
| Additional information and targets (data relate to human unless otherwise stated) | ||
| Description | Data | Reference | 
| Putative endogenous ligands at RTP Type Z1 | contactin-1 (CNTN1, Q12860), pleiotrophin (PTN, C9JR52) (acts as a negative regulator) | 1-2 |