> colnames(data1)[seq(2,ncol(data1), 15)]
[1] "AAAA" "AAGG" "ATGC" "ACGT" "AGGA" "TACG" "TTCC" "TCCT" "TGCA" "CATG" [1] "
阅读背景：
R语言ggplot2绘图设置X轴刻度，字体大小及绘图区大小
来源：互联网
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