Plasma insulin was measured in
duplicate by radioimmunoassay as described previously
[10] with intra- and interassay CV 8.2% and 15.5%, respec-
tively, and plasma glucagon concentrations were measured
in duplicate by using a commercial radioimmunoassay kit
(cat. # GL-32K, MILLIPORE, Zug, Switzerland, intra- and
interassay CV 4.0% and 12.5%, respectively).