sentences:  He then moved to the United States to earn his doctorate at the University of Texas Health Science Center at Houston, graduating in 1994.Jin was doing postdoctoral research at Stanford University that year when Tan, by then 86 years old, made a trip to the United States specifically to visit Jin to discuss the development of biology research in China and to offer him a position at Fudan.Jin eventually took up a part-time position at Fudan in 1997 before returning to China full-time in 2005.