PT Journal AU Puchta, H Hohn, B TI A transient assay in plant cells reveals a positive correlation between extrachromosomal recombination rates and length of homologous overlap SO Nucleic acids research PY 1991 BP 2693 EP 2700 VL 19 IS 10 DI 10.1093/nar/19.10.2693 LA english ER