24793
Although inhibition of crystal growth by l - cystine " imposters " at l - cystine crystal surfaces has been suggested as a plausible route for the suppression of stones , understanding the factors that govern crystal - crystal aggregation and adhesion of crystals to epithelial cells also is essential for devising strategies to mitigate l - cystine stone formation .
 Chemical: l - cystine; Chemical: l - cystine; Chemical: l - cystine
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: l - cystine; Chemical: l - cystine; Chemical: l - cystine