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Seeding barrier between K18 and K19. 10 μm K19 monomers were incubated for 3 h in the presence of 3% K19 seeds or 3% K18 seeds. The samples were sedimented by ultracentrifugation. Pellets were analyzed by 15% SDS-PAGE (a) and quantified by densitometry (b). All of the values represent the means ± S.D. (n = 3 experiments).
