The early days of structural biology at the Beijing Institute of Biophysics:In memory of Professor Zhengjiong Lin(1935-2022)

At the end of 2017,while I was cleaning my apartment in Beijing,a thin journal caught my attention deep in one dusty cabinet.To my surprise,it was an old lab notebook I used 55 years ago!I could not help opening it.Written on the first page was my mentor Zhengjiong Lin's assignment for my first project:To determine the crystal structure of a di-pep-tide,Proline-Glycine.