There was a clear up-regulation in the expression of more than 50 genes associated with the
immune inflammatory responses during the period of 4 to 10 days (Fig. 3a).
For example, CCL13 and CCL15 both exhibited large increases in their expression levels, with CCL13 reaching a 56-fold increase on day 7 and CCL15 reaching a 42-fold increase on day 10.