3680
Transfection of cells with the dominant negative mutant of ubiquitin Ub - K48R , which prevents the formation of Lys48 - linked polyubiquitin chains , abolishes PKC - stimulated OAT1 ubiquitination and internalization .
 Chemical: Lys48
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Lys48 
Answer:
 Chemical: Lys48