Additional file 4: Alignment S1. Alignment of cathepsin D1 (GenBank: EF428204.1) query sequence and a corresponding transcript recovered from Ixodes ricinus stage-specific transcriptome assembly (c79321_g3_i1).: Alignment S1. Alignment of cathepsin D1 (GenBank: EF428204.1) query sequence and a corresponding transcript recovered from Ixodes ricinus stage-specific transcriptome assembly (c79321_g3_i1).