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Sema4: Eli Casdin, Emily Leproust, Jason Ryan, Nat Turner

As part of its merger with special purpose acquisition company CM Life Sciences, Sema4 has appointed four new directors to its board: Eli Casdin, chief investment officer of Casdin Capital; Emily Leproust, CEO of Twist Bioscience; Jason Ryan, former chief operating officer and CFO of Magenta Therapeutics and former CFO of Foundation Medicine; and Nat Turner, cofounder of Flatiron Health.

The Scan

Looking for Omicron

NPR reports that SARS-CoV-2 testing in the US has gotten better but also that some experts say more needs to be done to better track the Omicron variant.

Holmes Alleges Abuse

The Associated Press reports that Theranos' Elizabeth Holmes has testified at her wire fraud trial that her business and romantic partner abused her.

Bit More Diverse, But More to Do

While Black and Hispanic patients are more likely to participate in cancer clinical trials than previously, they are still underrepresented, according to US News & World Report.

PNAS Papers on Yeast Gene Silencing, Zika Virus Inhibition, Immunoglobulin Hypermutation

In PNAS this week: gene silencing in Saccharomyces cerevisiae, possible neuroprotective role for SHFL in a mouse model of Zika virus infection, and more.