A novel multi-domain mucin-like glycoprotein of Cryptosporidium parvum mediates invasion1Note: Nucleotide sequence data reported in this paper are available in the EMBL, GenBank™ and DDJB databases under the accession number AF068065.1,2A portion of the amino acid sequence of GP900 was presented at the 47th annual meeting of the Society of Protozoologists and 3rd Workshop on opportunistic Protozoan Pathogens in Cleveland, Ohio, June 1994.2