Table I.

Extracellular vesicle characterization in terms of quantity, size, protein concentration, and purity.

Type	EV concentration, particles/ml (SEM)	EV size, nm (SEM)	Protein concentration, μg/μl (SEM)	Purity, particles/μg
pEV	1.0 × 1011 (7.5 × 1010)	121 (17)	0.269 (0.102)	3.1 × 108
cEV	2.7 × 1010 (9.0 × 109)	150 (15)	0.035 (0.015)*	9.7 × 108

Results were statistically compared using an independent-samples t-test.

^*p < 0.05 vs pEV.

cEV, human umbilical cord mesenchymal stromal cell-derived extracellular vesicle; EV, extracellular vesicle; pEV, platelet lysate-derived extracellular vesicle; SEM, standard error of the mean.