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Villous cytotrophoblastic cells were isolated by sequential enzymatic digestion of chorionic villi from the first trimester , second trimester and term placenta and purified on a discontinuous percoll gradient , as described previously . 47 - 49 These cells were positively stained for cytokeratin 7 at 95 % , indicating the cytotrophoblastic origin of the cells .
 Anatomy: Villous cytotrophoblastic cells; Anatomy: chorionic villi; Anatomy: placenta; Anatomy: cells; Anatomy: cells
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: Villous cytotrophoblastic cells; Anatomy: chorionic villi; Anatomy: placenta; Anatomy: cells; Anatomy: cells