Structure and location of N. lugens CLIP genes on scaffolds. (A) proclotting enzyme-1 and proclotting enzyme-2 genes; (B) snake-2 and snake-3 genes; (C) snake-1 and snake5-7 genes. The black arrows indicate the transcription orientations and gene sizes on scaffolds. The exons are shown with orange boxes. The schematic representation of the deduced CLIP structures is shown in the panel below. Red bars, hexagons, and oblongs indicate the putative signal peptide sequence, clip domain, and serine protease domain, respectively. The small black arrows flanking the CLIP genes are serine proteases without clip-domains. The size bar indicates the amino acid residues of the deduced CLIPs.