Scientists performed a comprehensive study organizing thousands of similar enzymes called polyphenol oxidases (PPOs) found across all living organisms into 12 distinct groups based on their evolutionary relationships. They discovered that a major gene duplication event in ancient times created two main types of these enzymes with different structural features and functions. This new classification system shows that fungal enzymes called o-methoxy phenolases are particularly abundant in certain fungi, likely helping them break down plant materials like lignin.