Mumbai, May 22 -- The key equity indices ended with modest gains on Friday amid positive global cues and hopes of a potential peace agreement between the US and Iran. The Nifty 50 ended above 23,700 mark after touching an intraday high of 23,835.65. Investor sentiment was supported by Brent crude oil prices easing to around the $105-per-barrel mark from recent highs near $110. The index traded higher for most of the session but pared some gains in late trade amid profit booking at higher levels. Gains were led by private banks and financial stocks, while healthcare and pharma shares witnessed selling pressure. However, overall market sentiment remained cautious amid persistent foreign institutional investor outflows and concerns over infl...