17180
Such effects determine the relative positions of the bile salts / acids in the headgroups of lecithin , thus resulting in varying efficiencies to alter the effective critical packing parameter for the formation of wormlike micelles .
 Chemical: bile salts / acids
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: bile salts / acids