Microfibril of Pinus radiata. Image acquired with TEM. The black arrow indicates the boundaries of a microfibril, which is approximately 28 nm in diameter. The white arrows indicate a single elementary fibril, which is 3.5 nm in diameter. See also Chinga-Carrasco et al. .
Chinga-Carrasco Nanoscale Research Letters 2011 6:417 doi:10.1186/1556-276X-6-417