Basal levels of autophagy marker LC3 in full thickness human skin sections from young and old donors.

<p>Representative fluorescence confocal photomicrographs for LC3 (red fluorescence) and DAPI is used for nucleic staining (blue fluorescence). (A) skin section from the photo-protected upper arm of a young donor, age 27 yr. (B) skin section from the photo-exposed lower arm of the same young donor. (C) skin section from the photo-protected upper arm of an old donor, age 60 yr. (D): skin section from the photo-exposed lower arm of the same old donor.