San Mateo-based stealthy startup Mousera recently raised $20 million, according to an SEC filing. This brings the company's total funding to at least $28.8 million. Existing investors include Lux Capital, Founders Fund, Data Collective, AME Cloud Ventures, and Dolby Family Ventures.

The company is developing a tool that helps biomedical investigators accelerate the preclinical drug discovery and development pipeline. Researchers will be able to use the offering to design, run, and analyze experiments using high volumes of data. The results will be more predictive of how drugs perform in humans.

The company’s CEO and Co-founder Timothy L. Robertson was previously the VP of Product Applications at Proteus Digital Health. Proteus offers a medication management and adherence system that includes sensor-enabled pills, a peel-and-stick biometric sensor patch worn on the body, and companion smartphone apps. The patch records when a pill is ingested and also tracks other things like sleep patterns and physical activity levels.

Mousera’s CTO, Joe Betts-Lacroix, was the technical founder of OQO, which developed handheld computers.

The company quietly raised its last round in October 2014.