Nikkei eases on profit-taking; Sharp dives as it seeks aid

* Sharp dives to 3-week low * Chip-related shares outperform after Nasdaq rises * Nikkei futures snap a 13-day winning streak * Regional banks lower after CLSA cuts ratings By Ayai Tomisawa TOKYO, March 3 (Reuters) - Japan's Nikkei share average fell in choppy trade on Tuesday as investors took profits from the recent gains, but losses were limited as sentiment was supported by strong Wall Street performances. Sharp Corp tumbled as much as 9.8 percent on news that it is