Distribution of amyloid in available Congo-red stained sections from the eight studied individuals with systemic AL amyloidosis and in who the amyloid proteins were derived from the κI gene O18-O8 or the κIII gene L2-L16.

Empty space, no tissue available; -, no amyloid; +, one or a few small amyloid deposits; ++, moderate amount of amyloid at several locations; +++, pronounced amyloid deposits; ++++, more than 50% of the tissue replaced by amyloid.
*pI for the variable part of the light chain.
**Amyloid cast found in some tubular lumina.