下载ｂｉｏｃｍａｎａｇｅｒ

下载`BiocManager`是安装和管理Bioconductor包的工具。可以通过以下方式下载`BiocManager`包：

if (!requireNamespace("BiocManager", quietly = TRUE))
  install.packages("BiocManager")

这段代码首先检查是否已经安装了`BiocManager`包，如果没有则会自动下载并安装。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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