ADDSs for ATA. The schematics present examples of classes of carriers tested for delivery of ATA, their principal structure, and PA cargoes. Synthetic carriers vary in size from few nanometers to several microns, shape, stability, and principle of drug loading and release. Liposomes and PEG represent the 2 most intensively studied ADDS for various ATAs including anticoagulants, platelet antagonists, and listed fibrinolytics.