17767
The calcium homeostasis proteins sarcoendoplasmic reticulum ATPase 2a ( SERCA2a ) , sodium calcium exchanger - 1 , phospholamban ( PLB ) , phospho - PLB , and calsequestrin 2 are important for contraction and relaxation .
 Chemical: calcium; Chemical: sodium; Chemical: calcium; Chemical: phospho
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: calcium, sodium, calcium, phospho 
Answer:
 Chemical: calcium; Chemical: sodium; Chemical: calcium; Chemical: phospho