“Damage of iodinated hormones has been observed with insulin (YALOW & BERSON, 1960), ACTH (YALOW et al., 1964), growth hormone (GLICK et al., 1963), and glucagon (EISENTRAUT et al., 1968) and EISENTRAUT et al. (1968) have demonstrated that such damage can produce falsely high values in the plasma glucagon assay.”