I would like to train a CellTypist model to identify certain cell types with a specific gene set. I tried feeding the function a list of genes using the 'genes' argument but it still trained using all features. Besides only keeping the select genes in the adata.var, are there any other approaches to make this work? Additionally, does training the model on <50 genes affect the accuracy of prediction of the trained celltypist model, or is there a threshold gene count below which you wouldn't recommend training a model? I would appreciate any help you can provide!