A computer graphics system has been used to fit a putative sequence to an electron density map of a sea snake neurotoxic protein at 2.2 A resolution. The complete sequence of this small protein could be determined from the map with very little ambiguity. In two places probable errors in the published chemical sequence were detected. This is the first instance in which a complete three-dimensional structure was solved with the use of computer graphics alone, without the construction of a physical model.
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