Signal sequence cleaved between Pro26 and Ile27 (Uniprot numbering, confirmed by MALDI-TOF). The protein is posttranslationally N- and O- glycosylated. The protein construct used for SAXS contains an additional polyhistidine 6x HisTag at the C-terminus for affinity purification connected to a non-native 17 amino acid linker (HLEQKLISEEDLNSAVDHHHHHH).