Cambridge venture capital firm Atlas Venture has raised its 11th fund, totaling $350 million, as it looks to advance its mission of “doing well by doing good” for biotechs.

Atlas has had a hand in a number of major startups over the years through funding rounds, incubation and launches. Over the past year, Atlas has helped with a series of funding rounds for biotechs, and late last year, in a first for the life science venture capital world, it teamed up with Third Rock in a $48.5 million series A to create and launch Magenta Therapeutics, a new biotech that aims to reset and refresh the immune system.

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