TY  - RPRT
TI  - A sequential "2-1-3" model of genetic code evolution that explains codon constraints.
AU  - Steven E Massey
PY  - 2006
DO  - 10.1007/s00239-005-0222-0
UR  - https://pubmed.ncbi.nlm.nih.gov/16612538/
ID  - 16612538
ER  -