Table 1. Nanotube parameters.

	ahex, Å	ϕ, Å	d, Å	i (n), Å	j (m), Å	γ, °	S, Å2
Lanreotide	365	244	243	20.7 (13)	20.8 (26)	119.0	377
Derivative	259	166	176	20.2 (11)	21.1 (18)	117.2	380

Supramolecular and molecular parameters of the nanotubes formed by Lanreotide and its derivative in water. Supramolecular parameter: a_hex is the hexagonal parameter (Fig. 5d) obtained by SAXS (Fig. 2c), ϕ is the diameter of the nanotubes (Fig. 5c) from SAXS (Fig. 2d), and d = a_hex − ϕ/2 (see text). Molecular parameter calculated from the fiber diffraction X-ray pattern (Fig. 4 and Fig. 6, which is published as supporting information on the PNAS web site, www.pnas.org): i and j are the unit-cell vectors of the bidimensional curved crystal (Fig. 4e), γ is the (i, j) angle, and S is the surface of the unit cell. n and m are the number of filaments whose direction is along i and j, respectively, constituting a nanotube.