TY  - RPRT
TI  - Selective constraints on P-element evolution.
AU  - D J Witherspoon
PY  - 1999
DO  - 10.1093/oxfordjournals.molbev.a026129
UR  - https://pubmed.ncbi.nlm.nih.gov/10331273/
ID  - 10331273
ER  -