NEW YORK, Mar 20: Roche Holding AG and a buyout group comprising KKR & Co LP and Hellman & Friedman LLC have joined the bidding for Life Technologies Corp, a genetic testing company coveted for its advanced diagnostics and steady cash flow, according to people familiar with the matter. Roche’s interest in Life Tech, a biomedical laboratory equipment maker with an 11 billion dollars market value, signals the Swiss drugmaker’s continued interest in gene sequencing a year after its 6.8 billion dollars hostile offer for Illumina Inc failed over price. (agencies)