In vivo autologous radiolabeled human platelet recoveries and survivals. The survival curves for radioactively labeled galactosylated (closed symbols) and control (unmodified) (open symbols) autologous platelets obtained from 4 healthy volunteers stored for 48 hours at 4°C or 22°C are shown. The corresponding type of treated (closed) and control (open) symbols are shown for each volunteer: volunteer 1 (■, □), volunteer 2 (●, ○), volunteer 3 (▴, ▵), and volunteer 4 (♦, ◇). The galactosylated platelets were all stored at 4°C, whereas the control (unmodified) platelets were stored at either 22°C (volunteer 2, ○; volunteer 4, ◇) or at 4°C (volunteer 1, □; volunteer 3, ▵).