<prompt> Amyloid protein in human being is:A naturally present protein in normal individualsInvolves selectively blood vesselsIs visible by naked eyes as whitish cheesy materialA material which gets deposited in extracellular spaces  <response>: Ans. D. A material which gets deposited in extracellular spacesRef. Robbins and Cotran Pathologic basis of Disease 9e Chapter 6Amyloid FibrilsPhysical nature of amyloidX-ray crystallography and infrared spectroscopy demonstrate a characteristic cross-b-pleated sheet conformation. 