What is AMA and what is its advantage over ammonium hydroxide as a deprotection solution?

AMA is a 1:1 mixture of 28% (or higher) ammonium hydroxide and 40% aqueous methylamine used to deprotect oligos synthesised with fast deprotection amidites (d/rABz, d/rGdmf, d/rCAc). This shortens the deprotection time to 10min at 65^oC compared with 2-3h in ammonium hydroxide at the same temperature.