A total of 137 proteins showed significant changes between the 72 and 0 h PG samples, with 80 up-regulated and 57 down-regulated proteins (Fig.1, and Table S1). Further GO classification analysis of these proteins was performed. For molecular functions, 43% and 39% of the differentially expressed proteins were associated with binding and catalytic activities, respectively. For cellular components, 38% and 21% of the differentially expressed proteins were related to cells and macromolecular matrix, respectively (Fig. 2).