Interesting Unit at http://en.wikipedia.org/wiki/Insulin-like_growth_factor_1
forth paragraph down: IGF-1 consists of 70 amino acids in a single chain with three intramolecular disulfide bridges. IGF-1 has a molecular weight of 7,649 daltons. There is another page on Daltons http://en.wikipedia.org/wiki/Dalton_%28unit%29 A unit accepted for use with SI, seems with the prefixes we have, some sub unit of a gram would have been equally good. Or is this something like the Astronomical unit on the other end of the scale? Michael Payne
