Tumor xenografts were generated in the flanks of nude mice using indolent A375P (n=5) and aggressive C8161 (n=7) melanoma cell lines. (A) Tumor size after 33 days, p=0.001, t-test (B–D)Tumors were processed for EM; (B) Mean number AV/cell; p=0.001, Mann-Whitney test. Representative images of tumor cells from (C) two different A375P tumors and (D) two different C8161 tumors; scale bars: 2μm. (E) Lysates from three separate A375P and C8161 tumors were used for immunoblotting against the autophagy markers LC3, p62 and ATG5, and actin loading control.