Figure 3: The correlation of z and 2·R·sin (ΔΦ/2) in the helix parameters. (A) All 642 LRRs; (B) 139 LRRs with the repeat number n ≥ 10 in the four classes of “RI-like”, “Cysteine-containing”, SDS22-like, and “Plant-specific”. Some LRRs in the “TpLRR” class deviate from the common circle; this can be attributed to a larger twist angle of β-sheets, a breaking of β-strands in the HCS; or a prism like shape for the LRRs. “R” is the helix radius of a helix consisting of n repeat units, “Δz” the rise per repeat unit, and “ΔΦ” the rotation per repeat unit.