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Measured attenuation coefficients (±1 standard deviation) as a function of frequency at 25°C (solid lines) and 37°C (dashed lines) for (a) Definity, (b) MicroMarker, (c) echogenic liposomes (ELIP), (d) enhanced ELIP and (e) recombinant tissue plasminogen activator (rt-PA)-loaded ELIP.
