Al-Younes, H. M., Gussmann, J., Braun, P. R., Brinkmann, V., & Meyer, T. F. (2006). Naturally occurring amino acids differentially influence the development of Chlamydia trachomatis and Chlamydia (Chlamydophila) pneumoniae. Journal of Medical Microbiology, 55(7), 879-886. doi:10.1099/jmm.0.46445-0.