SC3 provides an expression matrix after clustering genes by kmeans with k = 100. How does one extract the cluster to which each gene was clustered? I checked the features data (fData) but this data isn't included. Oddly, the column sc3_N_markers_clusts has numbers ranging from 1 to N, where N is the k used to cluster cells, not genes. I'm not sure how a gene can be discretely associated with a cell cluster and I think perhaps this column was intended for the gene clusters instead.