Figure 1. Structures of NPPB, 3NB, and 3PP. NPPB structure and its division into head (3NB, blue) and tail (3PP, red) parts.
Figure 1.

Structures of NPPB, 3NB, and 3PP. NPPB structure and its division into head (3NB, blue) and tail (3PP, red) parts.

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