Which of the following statements about apical and basolateral protein sorting is false?
a. Transcytosis is a mechanism for the movement of basolaterally secreted proteins to the apical membrane.
b. Infection of epithelial cells with specific viral proteins has helped elucidate the mechanisms of polarized protein secretion.
c. GPI-linked proteins are sorted specifically to the apical membrane of most polarized epithelial cells.
d. Vesicles that bud from the trans-Golgi network travel specifically to the apical membrane.
