Read 10x-Genomics-formatted mtx directory (Read10xCounts())

The mtx directory should contain:

1. Raw expression quantification as a sparse matrix in Matrix Market format, where the each column is a gene and each row is a barcode/cell.
2. A gene table of at least two columns where the first column gives the gene IDs.
3. A barcode/cell table of at least one column giving the barcode/cell IDs.

The above-mentioned files can be obtained by running EBI SCXA Data Retrieval with a dataset accession.

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