heterochromatin [ˌhetərə'kroʊmətn]

例句:

• Heterochromatin has shown to be composed largely of short repeated polynucleotide sequences.
  异染色质大部分是由短而重复的多核苷酸序列所组成的.
  
• Chromosome material with exhibits of such behaviour is called heterochromatin.
  表现这种现象的染色体物质叫做异染色质.
  
• What other functions abundant heterochromatin may perform are still an open question.
  至于大量的异染色质还有什么作用仍然是一个问题.