BOSTON--(BUSINESS WIRE)--On June 30, 2015, Tekla Life Sciences Investors paid a quarterly stock distribution of $0.54 per share. It is currently estimated that this distribution is derived from short-term capital gains. The composition of this and subsequent distributions may vary from quarter to quarter because it may be materially impacted by future realized gains and losses on securities. The aggregate of the net unrealized appreciation of portfolio securities and net realized gains on sale