Correlation coefficient of the percentage compositions of amino acids at different positions of two types of π-HB turns and those in a) α-turn of the type AAA, b) type-I β-turn, c,d) C- and N-termini of 310-helix. In the left AAAa type of π-HB turns are used, and in the right are AAAA π-HB turns. β-Turns include both hydrogen-bonded and non-hydrogen-bonded categories, while only hydrogen-bonded α-turns are taken. The color code is explained in the Figure 5a.
Dasgupta and Chakrabarti BMC Structural Biology 2008 8:39 doi:10.1186/1472-6807-8-39