>3zxn_A mol:protein length:123 ANTI-SIGMA-FACTOR ANTAGONIST (STAS) DOMAIN PROTEINMSSRVPILKVDDYWVVAIEETLHDQSVIQFKEELLHNITGVAGKGLVIDISALEVVDEFVTRVLIEISRLAELLGLPFVLTGIKPAVAITLTEMGLDLRGMATALNLQKGLDKLKNLARMEQR