👤 Nagano, H. Keywords 🔗 bronchitis virus (233) 🔗 infectious bronchitis (235) 🔗 electron microscopy (149) 🔗 results indicate (178) Articles (1) Purification of infectious bronchitis coronavirus by Sephacryl S-1000 gel chromatography 👤 Nagano, H. 👤 Yagyu, K. 👤 Ohta, S. ⏰ 1989 📚 Veterinary Microbiology