8168
Ion current peaks ( as opposed to blockades ) were produced by both positively ( Rhodamine 6G ) and negatively ( Alexa 546 ) charged molecules , showing that the charge filtering responsible for the current bursts is caused by the molecules themselves .
 Chemical: Rhodamine 6G; Chemical: Alexa 546
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: Rhodamine 6G; Chemical: Alexa 546