Hi all, We crystallised a small GTPase expressed in E. Coli and found some densities in GDP/GTP binding site. We didn’t add any GDP/GTP or GDP/GPD homologues during protein expression, purification and crystallisation. The resolution is not high, we couldn’t tell what it is. Is there any method to detect what it is? Thanks! Best wishes! yamei ************************************************ Yamei Yu State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University,Chengdu,610041, P.R.China Tel: 15882013485 Email: [log in to unmask] [log in to unmask] [log in to unmask]