Table 2.

Structural clusters in Aβ_10–40 tetramer

Cluster	p∗	S†	H‡	C§	(C(Nt), C(Ct))¶	Nhb‖	Nihb∗∗
T1	0.46	0.46 (0.48,0.47)	0.14 (0.21,0.09)	60.9	(33.0,16.4)	8.2	5.2
T2	0.23	0.29 (0.16,0.46)	0.30 (0.52,0.10)	51.0	(26.0,16.4)	4.8	10.8
T3	0.19	0.33 (0.37,0.27)	0.23 (0.32,0.19)	52.6	(31.1,11.9)	5.3	10.7

^∗Fraction of structures included in the cluster, i.e., occurrence probability.

^†Fractions of β-structure in Aβ peptide and in the Nt and Ct terminals (in parentheses).

^‡Fractions of helix in Aβ peptide and in the Nt and Ct terminals (in parentheses).

^§Number of interpeptide contacts formed by a peptide in oligomer.

^¶Numbers of interpeptide contacts formed by the Nt and Ct sequence regions.

^‖Number of interpeptide HBs formed by a peptide in oligomer.

^∗∗Number of intrapeptide HBs in a peptide.