A keratinocyte in an advanced stage of transformation from a granular
cell to a corneocyte. Lysosomes/autophagosomes (L) are present in the cytoplasm.
Filaggrin (K) is spread throughout the cytoplasm intermingling with keratin
filaments (F). The thickened, modified corneocyte envelope (PM) is tightly
attached to the lower granular cell. The nucleus (N), last of the recognizable
organelles, shows signs of degradation. Reprinted from ©Lavker and Matoltsy, 1970, J Cell Biology,
44:501–512