Table 2. Percentage of viable THP-1 and U-251 cells at different time points after FePro labeling as assessed by Trypan blue viability test.

	25 Fe/0.7 Pro		50 Fe/1.5 Pro		100 Fe/3 Pro		Non-labeled
	THP-1	U-251	THP-1	U-251	THP-1	U-251	THP-1	U-251
2 h	88.0%	83.3%	94.1%	86.1%	92.7%	86.6%
4 h	90.0%	89.5%	94.7%	90.2%	92.0%	90.1%
24 h	94.7%	82.8%	94.2%	84.3%	90.0%	89.0%	93.5%	88.7%
48 h	94.0%	82.5%	92.0%	86.3%	89.6%	85.6%