July 22 (Reuters) - Microgen PLC  MCGN.L : * Investec raises target price to 147p from 133p; rating hold For a summary of rating actions and price target changes on European companies:  Reuters Eikon users, click on  RCH/EUROPE   Reuters 3000Xtra users, double-click  RCH/EUROPE   Reuters Station users, click .1580   ((nyc.equities.newsroom@reuters.com); (Reuters Messaging: saqib.ahmed.thomsonreuters.com@reuters.net) ((Bangalore Newsroom +91 80 6749 1130; within U.S. +1 646 223 8780))