Human brain mitochondrial ultrastructural patterns. (A–C) Normal survival category (A, Case #12, Penumbra zone; B, Case #1, Far zone; C, Case #1, Penumbra zone); (D–G) Normal reactive category (D, Case #12, Far zone; E, Case #13, Far zone; F, Case#11, Far zone; G, Case #1, Penumbra zone); (H–M) Reactive/degenerating category (H, Case #13, Far zone; I, Case #12, Far zone; J, Case #16, Far zone; K, Case #14, Penumbra zone; L, Case #17, Far zone; M, Case #2, Near zone; arrow shows mitochondria-derived vesicles). Scale bar equals 500 nm.