Ribbon diagram of a replicative DNA polymerase encountering a DNA lesion.
(S. Doublie More Info and S. Wallace More Info)

Molecular model
of the hairpin ribozyme cleavage site
(R. Pinard et al)
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Fibroblast infected with Toxoplasma gondii
(blue = nuclei, red = parasite membrane)
(M. Wichroski)
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