19169
By modulating expression levels of endogenous APP in primary cortical neurons , the frequency and amplitude of calcium oscillations is modified , implying a key role for APP in maintaining neuronal calcium homeostasis essential for synaptic transmission .
 Chemical: calcium; Chemical: calcium
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: calcium; Chemical: calcium