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scRNA-seq: Quality Control and Preprocessing
Pitfalls
Mitochondrial threshold too strict: pct_counts_mt < 5% discards real cells in metabolically active types (cardiomyocytes, hepatocytes). Always check the joint distribution with total counts.
Skipping var_names_make_unique(): duplicate gene symbols cause cryptic downstream errors.
Normalizing before QC filtering: low-quality cells bias normalization. Filter first.
HVG selection on raw counts: must use normalize
[Description truncada. Veja o README completo no GitHub.]