Mycoplasma mycoides Bacterial Cell David S. Goodsell, a biologist, combines information from structural biology, microscopy and biophysics to simulate images of the molecular structure of living cells. This watercolor illustration shows a cross section through an entire Mycoplasma cell, depicting molecules such as DNA (yellow) and ribosomes (magenta), surrounded by a protective cell membrane (green). David S. Goodsell 2011 Courtesy of David S. Goodsell, Scripps Research Institute