Classification of Loci
| Type | Class | Description | No. | Symbol |
| 1 | G | Gene: Transcribed region of the genome | 252 | Hugo > UniGene > GDB |
| g | Predicted gene based on UniGene clusters (n = 229) or sequence analysis (n = 35) | 264 | GenBank accession no. | |
| 2 | P | Polymorphic: Multiple polymorphisms[ii] | 15 | D-number |
| V | Variable Number of Tandem Repeats (VNTR) | 2 | ||
| Q | Tetra-nucleotide repeat | 20 | ||
| T | Tri-nucleotide repeat | 7 | ||
| D | Di-nucleotide repeat | 83 | ||
| R | Restriction Fragment Length Polymorphism (RFLP) | 1 | ||
| U | Unknown polymorphism | 7 | ||
| 3 | N | Nucleic acid[iii] | 317 | GenBank accession no. |
| Total | 968 |
[i] 1, Genes; 2, polymorphisms; 3, DNA sequence.
[ii] Multiple polymorphisms with the same D-number.
[iii] Nucleic acid sequences that may include ESTs not yet associated with predicted genes and sequence-tagged sites.