acid, acetic acid, and EDTA disodium salt were purchased from Fisher
Scientific (Pittsburgh, PA). Borane pyridine, formaldehyde, and deuterium
formaldehyde were from Sigma-Aldrich (St. Louis, MO). 2,5-Dihydroxybenzoic
acid (DHB) used as MALDI matrix was obtained from MP Biomedicals,
Inc. (Solon, OH). Acidified Methanol was prepared using 90% Methanol,
9% acetic acid, and 1% water.