Genes classified into 16 categories according to the status of age-related expression.

Depending on the status of expression, all spots on the microarray can be divided into 16 categories. Here, “1” represents an expressed gene and “0” represents an unexpressed gene.依据基因表达状态的不同，基因芯片（microarray）上的所有位点可被划分为16个类别。此处以“1”代表已表达的基因，“0”代表未表达的基因。