TY - RPRT TI - Reduced amino acid substitution matrices find traces of ancient coding alphabets in modern day proteins AU - Douglas, J. AU - Bouckaert, R. AU - carter, c. W. AU - Wills, P. PY - 2025 DO - 10.1101/2025.02.19.639152 UR - https://www.biorxiv.org/content/10.1101/2025.02.19.639152v1 ID - 10.1101/2025.02.19.639152 ER -