23andMe, the Mountain View, CA-based maker of consumer-oriented genetic tests, said today it has raised another $9 million to top off its Series C venture round at a total of $31 million. MPM Capital joined the investment round, and MPM’s Ashley Ledbetter Dombkowski is joining the company’s board in connection with the financing. 23andMe said back in November that it had raised the first $22 million of this round from Johnson & Johnson Development Corporation, New Enterprise Associates, and Google Ventures. Today’s announcement also says that Roche Venture Fund participated. The financing “will enable us to bring the vision of personalized medicine to consumers faster,” 23andMe co-founder and CEO Anne Wojcicki said in a statement.