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Broad range of historical material since 1903, about plasmids and application of circular DNA in molecular biology, with bibliography of early plasmid research compiled William C. Summers, for the American Society for Microbiology.
Sequence-specific recognition of DNA using high affinity synthetic molecules, for the regulation of gene expression, at California Institute of Technology, Pasadena.
A database of nucleotide sequences maintained by the US National Center for Biology Information. Includes news, search functions and methods for submitting sequences.
Chime-dependent tutorial which permits image manipulation to help understand the 3-dimensional form of the structure, from John Tweedie and Massey University, New Zealand.