Table 1

Preservation of serum in refrigerator

Preservation EGF (ng/ml)Vitamin A (μg/dl)TGF-β1 (ng/ml)
Initial day0.51 (0.08)45.5 (19.1)33.2 (6.8)
1 week 0.50 (0.10)45.5 (19.0)32.9 (81)
1 month 0.51 (0.08)49.7 (20.5)32.1 (4.7)