>3IL2_2|Chains C, D|Rex operator DNA|null CGCUGUGAACGCGUUCACAGCG >3IL2_1|Chains A, B|Redox-sensing transcriptional repressor rex|Thermus thermophilus HB27 (262724) GMKVPEAAISRLITYLRILEELEAQGVHRTSSEQLGELAQVTAFQVRKDLSYFGSYGTRGVGYTVPVLKRELRHILGLNRKWGLCIVGMGDLGSALADYPGFGESFELRGFFDVDPEKVGRPVRGGVIEHVDLLPQRVPGRIEIALLTVPREAAQKAADLLVAAGIKGILNFAPVVLEVPKEVAVENVDFLAGLTRLSFAILNPKWR