Transmembrane mucin that may be involved in cellular adhesion and the innate immune response (PubMed:8662683, PubMed:12769978). Membrane-tethered mucins are involved in many cell surface functions and form a physical barrier around cells to regulate cell-cell and/or cell-substrate interactions, and protect against pathogens or harmful extracellular conditions (PubMed:8662683, PubMed:12769978, PubMed:11164341). This mucin likely acts in hemocyte adhesion as it is released from hemocytes during coagulation and is also able to bind lipophorin particles which form part of the hemocyte coagulogen (PubMed:12769978). Able to induce expression of the antibacterial proteins in the presence of GalNAc-specific lectins and so probably also functions in the innate immune response (PubMed:8662683). Interacts with sturkopf. Detected on membrane of hemocytes. Detected in ovaries (at protein level) (PubMed:11164341). In larvae, detected in the fat body, salivary glands, imaginal disks and gut (at protein level) (PubMed:11164341). In adults, expressed in the cardia, and in regions of the ventriculus including the area posterior to the cardia (PubMed:8662683). In females also expressed in follicle cells (PubMed:8662683). Detected throughout development and in adults (at protein level) (PubMed:11164341). Expressed in embryos, larvae and adults (PubMed:8662683). By ecdysone; in embryonic cell lines. O-glycosylated. Glycosylated in the ovary of 4 day old females. Phosphorylated. Belongs to the strictosidine synthase family.