Yeager C., N.J. Hillson, K. Wozniak, V.K. Mutalik, C.W. Johnson, K.R. Pomraning, and P. Laible, et al. 2025.The Tier System: A Host Development Framework for Bioengineering.Current Opinion in Biotechnology 92:Art. No. 103260.PNNL-SA-203509.doi:10.1016/j.copbio.2025.103260