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A) SEM micrograph of a bundle of fibres, covered by an amorphous coating marked by evident longitudinal extrusion streaks. B) High magnification detail of the fractured surface of a byssus fibre; in contrast with the smooth, featureless fibre surface (lower-left part of the picture), the fracture plane shows a tight packing of straight, parallel subfibrils; the fracture does not appear to follow a preferential plane.
