10964
The pJR vectors differ among them in : ( a ) the selectable marker ( Saccharomyces cerevisiae LEU 2 gene , which complements S . pombe leu1 - gene and S . pombe ura4 + and his3 + genes ) ; ( b ) the thiamine - repressible nmt1 promoter ( 3X , 41X and 81X with extremely high , moderate or low transcription efficiency , respectively ) ; and ( c ) the multiple cloning site ( two multiple cloning sites , with 12 restriction sites each ) .
 LEU 2 gene, S . pombe leu1 - gene, ura4 +, his3 + genes, nmt1 promoter
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 LEU 2 gene, S . pombe leu1 - gene, ura4 +, his3 + genes, nmt1 promoter