14586
By using a PDMS - based spotting device , we remove the need for a microarray printer necessary to perform previously described small scale ( e . g . cellular microarrays ) and microchip - based RNAi screening , while still minimizing reagent usage tenfold compared to conventional screening .
 Chemical: PDMS
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: PDMS