The three founders of newly launched Volastra Therapeutics Inc. had plenty in common when they decided to create the company. Their offices happened to be a half block apart on 69th Street in midtown Manhattan. Their interests in oncology were similar but each approached the disease from different angles.

When developmental neurobiologist Arnold Kriegstein talks about his work, it sounds for all the world like he is talking about the brains of teenagers. They are stressed. Their identity is mixed up. But putting them in a good environment is helpful to their development. Kriegstein, though, was describing brain organoids.