Superposition of LF structures showing the movement of N-terminal residues in the PspA2: NLF complex. NLF chains (A and B, shown in yellow and green, respectively) are superposed on the full length hLF structure (PDB ID, 1FCK, shown in brown). The N-terminal 15 amino acid residues of each chain are shown in stick model. While terminal residues 3–5 of NLF in the complex shift considerably from the corresponding residues in free hLF, the remaining residues show no movement.