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Comparison of the SBMA sperm typing results with mutation frequency data on normal alleles supports the hypothesis that trinucleotide repeat expansions may have a different molecular origin than contractions .
 cell type: sperm; DNA: trinucleotide repeat
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: sperm, trinucleotide repeat 
Answer:
 cell type: sperm; DNA: trinucleotide repeat