Which protein primarily constitutes the keratohyaline granules found in the stratum granulosum of keratinized epithelial tissue?

Explanation

The main protein present in keratohyaline granules within the stratum granulosum of keratinized epithelium is filaggrin. Other proteins listed, such as involucrin, vinculin, and nectin, have different roles in cellular structure and adhesion.