Table 2.

TGF- β1 level in U87 cell MG cells at different levels of confluency

Confluency	Mean TGF-β 1 conc (pg/mL)	SD
90%–100%	316.7528	13.86
70%–80%	427.7014	82.10
60%	759.0877	137.52
50%	243.4502	82.64
Serum-free media	0

Data shown as mean and standard deviation (S.D) of receptors expression (n = 2).