The IgGFc-binding protein FCGBP is secreted with all GDPH sequences cleaved but maintained by interfragment disulfide bonds.
Ehrencrona E, van der Post S, Gallego P, Recktenwald CV, Rodriguez-Pineiro AM, Garcia-Bonete MJ, Trillo-Muyo S, Bäckström M, Hansson GC, Johansson MEV. J Biol Chem. 2021 Jul; 297(1):100871. Epub 2021 Jun 11.