2151
Tail vein injection of N - ( 1 - ( 2 , 3 - dioleoyloxy ) propyl ) - N , N , N - trimethylammonium chloride ( DOTAP ) / cholesterol lipoplexes resulted in increased lipoplex entrapment in hypervascularized liver but did not boost luciferase expression , suggesting that lipoplex delivery is not a sufficient condition for efficient organ lipofection .
 Tail vein, liver, organ
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Tail vein, liver, organ