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Analysis of 15N - 1H NMR relaxation in proteins by a combined experimental and molecular dynamics simulation approach : picosecond - nanosecond dynamics of the Rho GTPase binding domain of plexin - B1 in the dimeric state indicates allosteric pathways .
 Chemical: 15N; Chemical: 1H
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: 15N; Chemical: 1H