3147
NMDA receptors regulate channels that are highly permeable to calcium , and calcium imaging data demonstrated that neurons exposed to ketamine had a significantly elevated amplitude of calcium influx and higher intracellular free calcium concentrations ( [ Ca ( 2 + ) ] i ) evoked by NMDA ( 50 micro M ) , compared with control neurons .
 Chemical: NMDA; Chemical: calcium; Chemical: calcium; Chemical: ketamine; Chemical: calcium; Chemical: calcium; Chemical: Ca ( 2 + ); Chemical: NMDA
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: NMDA; Chemical: calcium; Chemical: calcium; Chemical: ketamine; Chemical: calcium; Chemical: calcium; Chemical: Ca ( 2 + ); Chemical: NMDA