Biography: Dr. Zhangguo Liu, Associate Professor in Zhejiang Agriculture & Forestry University, China. My long term research interests: (1) molecular mechanisms of poultry eggshell quality; (2) nutritional effects on microscopic fabric of poultry eggshell. My current research interests: (1) characterization of fine structures of glycosaminoglycan chains of eggshell proteoglycans; (2) molecular mechanisms of post-translation modification on eggshell components, such as proteoglycans OC-116.