21884
The initial reaction rates and the apparent Michaelis constants of the enzymatic reaction were obtained in the absence and presence of Al ( 3 + ) and nanometre - sized tridecameric aluminium polycationic ( nano - Al ( 13 ) ) species .
 Al ( 3 + ), tridecameric aluminium, Al ( 13 )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Al ( 3 + ), tridecameric aluminium, Al ( 13 )