The complex infective apparatus corresponding to the central mass of cytoplasm within a spore that is injected into a host cell by various parasitic microorganisms. [ http://www.ncbi.nlm.nih.gov/pubmed/12076771 http://www.ncbi.nlm.nih.gov/pubmed/16004371 http://www.ncbi.nlm.nih.gov/pubmed/9723921 ]