Table - link
||"Physical Biology of the Cell", Rob Phillips, Jane Kondev and Julie Theriot (2009). Page 417 fig. 11.11
||Stryer et al, Biochemistry, 5th edition 2002, Chapter 12 Lipids and Cell Membranes Fig 12.15 pp. 328
||Membranes are most permeable to water ~5×10^-2 cm/sec and least permeable to ions 10^-12 cm/sec. Tryptophan, a zwitterion at pH 7, crosses the
membrane 1000 times as slowly as does indole, a structurally related molecule
that lacks ionic groups.