30655
Genetic studies of Spitz nevi have shown that most cells have the normal number of chromosome s , however a minority ( 25 % ) of cells have been shown to contain extra copies of parts of some chromosomes , such as the short arm of chromosome 11 ( 11p ) .
 Spitz
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Spitz