4842
He is also the founder of the Center for Stem Cell Biology and Tissue Engineering at  Sun Yat-sen University   Guangzhou  China .
 city of headquarters: Sun Yat-sen University, Guangzhou
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 city of headquarters: Sun Yat-sen University, Guangzhou