Purdue University researchers found that a subset of epidermal cells in plant leaves serves as early responders to chemical ...

T cells, also known as lymphocytes, are a type of white blood cell that play an important role in the body's immune response.

Think of sap as the blood of a tree. According to Texas A&M University, there are two types of sap: phloem and xylem. Phloem sap is the more nutrient-rich form that flows from the leaves and ...