Table 2.

Hydrogen peroxide elimination ([H₂O₂]=5 μM) and toxicity. Cell cultures: embryonic stem cells (ESCs), their differentiated progeny cells (difESCs) and endometrial mesenchymal stem cells (eMSCs).

	Cells
Parameter	ESCs	difESCs	eMSCs
kcell, s−1 cell−1 L	3.0±0.5×10–12(N=5)	16±2×10–12 (N=4)	10±1×10–12 (N=4)
kprot, s−1 g−1 L	3.7±0.6×10−2 (N=5)	4.7±0.5×10−2 (N=4)	2.0±0.2×10−2 (N=4)
LD50cell, pmole/cell	1.0±0.3 (N=3)	11±1 (N=2)
LD50prot, mmole/protein g	12±4 (N=3)	20±2 (N=2)

Notations: k_cell and k_prot, first-order rate constants for the external H₂O₂ removal quantified on the per-cell, or per-protein basis, correspondingly; LD50_cell and LD50_prot, cytotoxic thresholds assessed as H₂O₂ dose which resulted in 50% cell death and estimated either in mole-per-cell, or mole-per-protein units, correspondingly.