5307
The sustained increase in [ Ca ] i was generated by entry from the extracellular bath since it was blocked by pretreatment with La3 + ( 1 microM ) and was absent when bath calcium was chelated with EGTA .
 extracellular
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 extracellular