22452
One - way traffic of dsDNA translocation is facilitated by five factors : ( 1 ) ATPase changes its conformation to revolve dsDNA within a hexameric channel in one direction ; ( 2 ) the 30 degrees tilt of the channel subunits causes an antiparallel arrangement between two helices of dsDNA and channel wall to advance one - way translocation ; ( 3 ) unidirectional flow property of the internal channel loops serves as a ratchet valve to prevent reversal ; ( 4 ) 5 ' - 3 ' single - direction movement of one DNA strand along the channel wall ensures single direction ; and ( 5 ) four electropositive layers interact with one strand of the electronegative dsDNA phosphate backbone , resulting in four relaying transitional pauses during translocation .
 Chemical: phosphate
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: phosphate 
Answer:
 Chemical: phosphate