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HA domain alignment. All proteins are from S. coelicolor except Q9PK68 (Chlamydia muridarum), Q9L8V8 (S. lividans), Q98RX4 (Guillardia theta). The line marked HA_SS is the predicted secondary structure of the HA domain. The line marked HtrF is the secondary structure of the HtrF protein (PDB: 1BA5).
