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“Charged and polar residues (D, H, K, N, Q, R, S) are more incident in the immediate surrounding of tryptophan (-6, -5, -2, -1, 1, 2, 4) and hydrophobic residues (A, F, I , L, V, Y) are more rare than in remote positions.”
Molekuliarnaia genetika, mikrobiologiia i virusologiia • 2001 | View Paper
“In applying the method of Zipfel it has happened on different occasions, that I have failed to obtain growth (turbidity) in the tryptophane solution even with bacteria, which are known as strong indol liberators,2 as for example Bact.”