TY  - RPRT
TI  - Evidence from nuclear sequences that invariable sites should be considered when sequence divergence is calculated.
AU  - J S Shoemaker
AU  - W M Fitch
PY  - 1989
DO  - 10.1093/oxfordjournals.molbev.a040550
UR  - https://pubmed.ncbi.nlm.nih.gov/2622335/
ID  - 2622335
ER  -