Analysis of overall success of robotic crystallization

A total of about 140 different proteins have been commissioned and 62 have been crystallized with a quality suitable for X-ray diffraction (45%). On a per-drop basis, 300 crystallization experiments have been successful, representing an over¬all success rate of 3%.  PEG 3350 was the precipitant for 20, making it the single most successful crystallization agent.