These amazing results were also supported in test tube experiments where it was seen in human colon cells to activate a protective antioxidant response. (zestforever.com)
Lab benches were covered with ruled notebooks and plastic trays, some blue, some green, some red, each holding dozens of test tubes. (bookbrowse.com)
Instead, the game comes with a creation crystal — a sort of plastic test tube with a glowing rock inside, that players can put on the portal. (theguardian.com)