# Expression Module

This module provides functions for reading expression data from files and extracting data for a specific tissue.

## Usage

To use the `Expression` module, first import it:

julia using Expression

### `getExpression(filename)`

Reads expression data from a file and returns a DataFrame.

- `filename::AbstractString`: The path to the file containing expression data.

Example:

julia expressiondata = getExpression("path/to/expressiondata.tsv")

### `getTissue(df, tissue)`

Extracts expression data for a specific tissue from a DataFrame.

- `df::DataFrame`: The DataFrame containing expression data.
- `tissue::AbstractString`: The column name corresponding to the tissue of interest.

Example:

julia tissuedata = getTissue(expressiondata, "Tissue1")

Replace `"path/to/expression_data.tsv"` with the actual path to your expression data file.

For more information on working with DataFrames, refer to the [DataFrames.jl documentation](https://dataframes.juliadata.org/stable/).