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A simple and cost-effective protocol is presented for expression of perdeuterated, Ile/Leu/Val 1H/13C methyl protonated proteins from 100 ml cultures in M9 ++ /D2O medium induced at high (OD600 ~ 1 cell density in shaker flasks. This protocol, which is an extension of our previous protocols for expression of 2H/15N/13C and 1H/13C labeled proteins, yields comparable quantities of protein from 100 ml cell culture to those obtained using a conventional 1 L culture with M9/D2O medium, while using three-fold less α-ketoisovaleric (1,2,3,4-