TORONTO, Jul 28 (Reuters) - Toronto Stock Exchange S&P/TSX composite index .GSPTSE :
* Falls 21.37 points, or 0.13 percent, to 16,139.96 at open.TORONTO, Jul 28 (Reuters) - Toronto Stock Exchange S&P/TSX composite index .GSPTSE :
* Unofficially closes down 35.47 points, or 0.22 percent, at 16,125.86.