Used in plant biochemistry research to quantify levels of colorless anthocyanin reductase (LAR), an enzyme involved in proanthocyanidin (condensed tannin) biosynthesis. This ELISA kit enables researchers to measure LAR protein concentration in plant tissue extracts, helping study flavonoid pathway regulation, plant defense mechanisms, and tannin accumulation in crops and medicinal plants. It is particularly useful in breeding programs aiming to modify tannin content for improved forage quality, fruit characteristics, or health-related phytochemical profiles. The assay is designed for high sensitivity and specificity in laboratory settings, supporting reproducible quantification in agricultural and plant physiological studies.