1021
Expression of the kappa immunoglobulin light chain gene requires developmental- and tissue-specific regulation by trans-acting factors which interact with two distinct enhancer elements .
 DNA: enhancer elements; protein: trans-acting factors; DNA: kappa immunoglobulin light chain gene
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: enhancer elements, trans-acting factors, kappa immunoglobulin light chain gene 
Answer:
 DNA: enhancer elements; protein: trans-acting factors; DNA: kappa immunoglobulin light chain gene