7169
PEP - 19 is a small , intrinsically disordered protein that binds to the C - domain of calmodulin ( CaM ) via an IQ motif and tunes its Ca ( 2 + ) binding properties via an acidic sequence .
 Chemical: Ca ( 2 + )
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: Ca ( 2 + )