code/datums/dna/dna_block.dm 
| /datum/dna_block | A singleton for handling block-unique functions called by the DNA datum. |
|---|---|
| /datum/dna_block/identity | Blocks for unique identities (skin tones, hair style, and gender) |
| /datum/dna_block/feature | Blocks for unique features (mutant color, mutant bodyparts) |