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Terminals of C and D units. A–D: C units with simple (A), double (B), triple (C), and quadruple (D) calyces. D shows a rare example of a calyx terminal with calyces separated by a well-defined branch (arrowhead); typically, calyces in a terminal form a tight cluster. E–G: D units with a spine (E; arrowhead) and simple (F) and extensive (G) bouton terminals. Terminal in G corresponds to the leftmost asterisk in Fig. 3B.
