Used for the quantitative determination of LAR (Leucoanthocyanidin Reductase) enzyme activity in plant tissue extracts. This ELISA kit enables researchers to measure LAR levels in various plant species, supporting studies in flavonoid and proanthocyanidin (condensed tannin) biosynthesis pathways. It is particularly useful in plant biochemistry and genetic engineering research where modulation of secondary metabolites affects plant defense, coloration, and nutritional quality. The assay is applied in agriculture and horticulture to evaluate crop varieties with enhanced polyphenolic content for improved stress resistance or health benefits. Suitable for high-throughput analysis in plant physiology and metabolic studies.