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Abstract
The formation of heterogeneous fibers well observable under a magnifying glass in stirred “stroma-free” hemolyzates of outdated banked erythrocytes was found to be predominantly due to random surface denaturation of both hemoglobin and non-heme proteins at the air-liquid interface. Electrophoretic analysis revealed that the precipitated and washed fibers contain residual membrane proteins as well as a certain amount of hemoglobin. The latter, however, largely remains in solution.