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Naturally occurring homopolyamides are linear poly(amino acids) consisting either of glutamic acid (poly[γ glutamic acid], γ-PGA), lysine (poly[ɛ lysine]) or arginylaspartic acid (poly[α arginylaspartic acid], cyanophycin). γ-PGA is synthesized as the major component of capsules and slimes of several Gram-positive bacteria. Purified γ-PGA produced byBacillus licheniformis ATCC9945 is a high molecular...