Age of donor sand rat | Number of weeks of cultured | Mean histological grading score (mean +/- standard deviation) | |
---|---|---|---|
 |  | - TGFβ | + TGFβb |
10 weeks | 3 to 5 | 2.0 ± 0.0 (3) | 3.0 ± 0.0 (3) |
6 months | 3 to 6 | 1.0 ± 0.0 (3) | 2.7 ± 0.47 (3) |
20 months | 3 to 4 | 1.3 (2) | 3.3 (2) |