Diversity in post-translational modifications of proteins among Cryptosporidium spp. A) Divergent N-glycan precursors in different Cryptosporidium spp. and other apicomplexan parasites. B) Core structure of GPI-anchor and the critical enzymes involved in its biosynthesis. PIG-B is absent in Cryptosporidium ubiquitum but present in other Cryptosporidium spp., whereas PIG-W and PGAP1 are absent in all Cryptosporidium spp.