The Central Bank took part in this morning's session on US currency. It wasbuying dollars to prevent a retreat in the dollar exchange rate. Due to theCentral Bank's participation the average-weighted dollar exchange rate evengained RUR0.01 to 31.54 RUR/USD, specialists of some commercial bankspointed out in an interview with RBC. The Bank was buying dollars at alevel of 31.54 RUR/USD totaling, according to the experts' estimations,some $25m-30m. That is why the volume of trade at today's UTS has been thelargest since August 7. It amounted to $88m. It means that the CentralBank's share in this volume was about one third. .