Supersecondary motifs have been analysed in 240 proteins defined at resolutions of 0.25 nm or better. Using five classes of residue conformation (a,b,e,l,t) in the non-regular structure regions, we have identified 50 classes that occur at least five times, and eleven classes that occur more than twenty-five times. The sequence pattern of the eleven most frequently occurring motifs have been characterised. The results should be useful for homology modelling and structure prediction.
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