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A new rapid method of comparing three-dimensional protein structures using the sequence of dihedral angles is described. Systematic screening of protein structures by this method followed by detailed analysis reveals in particular that the calcium-binding protein carp parvalbumin is similar to cytochrome C2 from Rhodospirillum rubrum, cytochrome C is similar to hen lysozyme, carboxypeptidase A is similar to phage lysozyme. These results are completely unexpected and show interesting correlation with the recently determined intron-exon pattern in the genes coding for some of them.
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