TY  - RPRT
TI  - Mutations define essential and nonessential U2 RNA structures.
AU  - M Ares
AU  - A H Igel
PY  - 1990
DO  - 10.1007/bf00360444
UR  - https://pubmed.ncbi.nlm.nih.gov/2194105/
ID  - 2194105
ER  -