PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 7026532-3 1981 For 8-methoxypsoralen photoaddition, which induces both deoxyribonucleic acid interstrand cross-links and monoadditions, the pso1 mutation is epistatic to the rad6, rad52, and pso2 mutations, whereas it is synergistic to rad3. Methoxsalen 4-21 E2 ubiquitin-conjugating protein RAD6 Saccharomyces cerevisiae S288C 159-163