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Scientists at Yale University have found that the common weed Portulaca oleracea, commonly known as purslane, holds the key to creating drought resistant crops. According to the Yale study published in Science Advances, purslane integrates two metabolic pathways that enable the weed to resist drought while remaining highly productive. Purslane is unique because it possesses both C4 and CAM functions. Scientists have previously believed that C4 and CAM operated independently in the leaves of purslane.