Transmission electron micrographs of negatively contrasted digestant removed from the clots. Large pieces of clot observed in the supernatants. (A) This chunk consisting of pieces of fibers and aggregated smaller structures has been cleaved so that it is nearly separated from a larger mass at the location indicated by the arrow. (B) Lacy meshwork of fibers, protofibrils, and other cleaved pieces. (C) Aggregate consisting of pieces of fibers and smaller structures. Bar for (A) through (C) equals 0.5 μm. (D) Fiber bundles with splayed ends. Bar for (D) equals 0.1 μm.