What could be deduced from these data about the structure

What are the main points presented in the given article
May 1, 2020
Solution-One of the components is bovine serum albumin
May 1, 2020

What could be deduced from these data about the structure

Q. The two vesicle fractions are either untreated (-) or are incubated with the protease trypsin (+). The membrane vesicles are next washed, the membranes solubilized and the proteins denatured and analyzed by SDS gel electrophoresis and Western blotting using polyclonal antibodies against glycophorin A, an erythrocyte plasma membrane protein. The subsequent data are obtained:

What could be deduced from these data about the structure of glycophorin A