1 => The disorder is placed on the map based on its association with a gene, but the underlying defect is not known
2 => The disorder has been placed on the map by linkage; no mutation has been found
3 => The molecular basis for the disorder is known; a mutation has been found in the gene
4 => A contiguous gene deletion or duplication syndrome, multiple genes are deleted or duplicated causing the phenotype
| Gene Symbol | Chromosomal Location | Gene MIM number | Mapping Method | Phenotype | Phenotype MIM number | Phenotype Mapping Key |
| NTRK2 | 9q21.33 | 600456 | REa, A | Obesity, hyperphagia, and developmental delay, 613886 (3) | 613886 | 3 |
| NTRK2 | 9q21.33 | 600456 | REa, A | Epileptic encephalopathy, early infantile, 58, 617830 (3) | 617830 | 3 |