By Kevin Madagan

Thomas H. Lee Partners (THL) has acquired Red Nucleus, according to a news release.

Red Nucleus, founded in 1991 and based in Yardley, Pennsylvania, is a life sciences communication firm.

THL, based in Boston, is a private equity firm investing in middle market growth companies in three sectors, including healthcare. Founded in 1974, the firm typically targets companies with enterprise values between $250 million and $2.5 billion.

Terms of the acquisition were not disclosed. Industry reports indicated THL acquired Red Nucleus from The Riverside Company for more than $750 million.