CTSB and infection: Two other genes were also identified as being transcriptionally induced during infection, but, their silencing had no effect on parasite infectivity [5]: CATHB encodes the proapoptotic enzyme Cathepsin B and was tested in light of observed apoptosis of parasite-invaded cells [16],[17], while KIN1 encodes a histidine-rich putative antimicrobial peptide produced under NF-κB control [18].