Figure 3.

A. SdFFF fractogram of the reference sample of 70 and 250-nm particles mixed in surfactant. The secondary x-axis depicts the theoretical particle size corresponding to the elution time for two particle densities. B. SdFFF fractogram of 70 and 250 nm particles isolated from homogenized lung tissue. The inset graph is the circled area enlarged, emphasizing the 70 nm particle peak.