DUBAI, March 31 (Reuters) - Here are some Factors that mayaffect Middle East stock markets on Tuesday. Reuters has **tverified the press reports and does **t vouch of their accuracy. INTERNATIONAL/REGIONAL * GLOBAL MARKETS-Stocks rally on merger activity; dollargains * Oil down as Iran races for Tuesday deadline on nucleardeal * MIDEAST STOCKS-Saudi Arabia underperforms Gulf as banksslide on fee worries * PRECIOUS-Gold eyes 2nd monthly loss as U.S. rate hike infocus * Iran, powers rush for nuclear deal as clock ticks towarddeadline * U.S. ...