CTSB and cyst: For example, the regulation of gene expression during the cyst formation of Strepkiella histriomuscorum has been studied in the encystment and trophont stages through biochip technology, which suggested that cyst formation is associated with Ribosomal L7, Ribosomal acidic P2, Cathepsin B, Cathepsin H, Ubiquitin, Ca2+-ATPase and Actin17.