19553
The aim of this review was to describe current knowledge on the testicular changes occurring in KS , the associated changes in reproductive hormones and spermatogenesis , and the existing possibilities of biological fatherhood in 47 , XXY patients .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None