passed through a 0.22-lm syringe filter, and stored at 80 C. Aliquots were subsequently analyzed by ion-exchange chromatography (HITACHI L-8900 automatic amino acid analyzer, Tokyo, Japan)
passed through a 0.22-lmsyringe filter, and stored at 80 C. Aliquots were subsequentlyanalyzed by ion-exchange chromatography (HITACHI L-8900 automaticamino acid analyzer, Tokyo, Japan)