Fig. 1

Clustal alignment of the Kunitz domains of Smp_147710, Smp_179120, Smp_139840, Smp_147730 (SmKI-1), the 1^st Kunitz domain of Smp_052230, the 4^th and 6^th Kunitz domains of Smp_180810 and BPTI. The six conserved cysteine residues are highlighted in black, the P₁ site is shown by the black arrow head and the Kunitz family signature is shown as the double headed arrow