calculate_cor_mat       Performs aggregation based on cell clusters and
                        condition. Then, it calculates correlation
                        matrix of genes
calculate_normalized_ratio
                        Calculate cell scores based on number of genes
correct_gene_symbols    Process the cell markers names
enrich_genes            Performs parallel function on two lists
filter_correlation      Filter the genes based on specific correlation
                        threshold
filter_list             Process the cell markers that overlap between
                        the cell markers and scRNA matrix
fisher_test             Performs fisher exact test to get the
                        significant overlap between genes for cell type
                        assignment
match_characters        Process the cell markers that pass specific
                        threshold in the gene correlation matrix
phyper_test             Performs phyper test to get the significant
                        overlap between genes for cell type assignment
process_clus            Gets the associated cell types using
                        correlation-based approach
process_database        Process the database for the sctype approach
process_markers         Process the cell markers database and return
                        the processed list
sccca                   Run the pipeline for the cell type assignment
sctype                  Run the sctype approach as it's implemented by
                        Ianevski, A., Giri, A.K. and Aittokallio, T.
