5111
We present here MetalPDB ( freely accessible at http : / / metalweb . cerm . unifi . it ) , a novel resource aimed at conveying the information available on the three - dimensional ( 3D ) structures of metal - binding biological macromolecules in a consistent and effective manner .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None