1075
We used a series of cell clones from a human teratocarcinoma cell line , PA - 1 , to study the effect of transformation by an activated N - ras oncogene on the expression of genes involved in retinoic acid ( RA ) - induced differentiation and growth regulation .
 Anatomy: cell clones; Anatomy: teratocarcinoma cell line; Anatomy: PA - 1
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: cell clones; Anatomy: teratocarcinoma cell line; Anatomy: PA - 1