1502
Current - voltage measurements by eutectic GaIn drop contact on the monolayer show a significant increase ( up to 1 . 6 x 10 ( 3 ) times ) of the current at low bias after Pb ( 2 + ) complexation .
 Chemical: GaIn; Chemical: Pb ( 2 + )
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: GaIn; Chemical: Pb ( 2 + )