Inside a melanoma cell The three-dimensional structure of a melanoma cell. April 11, 2018 Cosmos Curated content from the editorial staff at Cosmos Magazine. By Cosmos The illustration above shows the three-dimensional structure of a melanoma cell, as derived from ion abrasion scanning electron microscopy data. In the cell can be seen mitochondria (red), endoplasmic reticulum (yellow), and the nucleus (gray). Originally published by Cosmos as Inside a melanoma cell