Table 1. Cells expressing AQP either exogenously or endogenously are resistant to ultra-quick freezing/thawing.

Cell lines	Expression of AQP4	Cell viability ± S.D. (%)
CHO	(-)	2.4±1.4
	AQP4	60.5±16.7
MDCK	(-)	0.7±0.8
	AQP4	37.2±8.7
Astrocytes	AQP4 KO	2.5±2.3
	WT	54.1±6.4

Cell viability after ultra-quick freezing/thawing: comparison between CHO, MDCK cells and stably expressing AQP4 cells (AQP4-CHO, AQP4-MDCK), and also primary culture astrocytes from WT-mice (AQP4+) or AQP4-null mice (n ≧ 3, ***P<0.001).