16871
These findings suggest that the neuronatin - induced aberrant Ca ( 2 + ) signaling and endoplasmic reticulum stress might underlie LD pathogenesis .
 Ca ( 2 + )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Ca ( 2 + )