Glucose 6 phosphate Dehydrogenase (G6PD) Deficiency Concise Medical Knowledge Persistent red blood cells retain their ability to move in microcapillaries under high levels of oxidative stress Communications Biology Heinz bodies are small clumps of damaged hemoglobin found inside red blood cells. They form due to oxidative stress and are often seen in conditions like G6PD deficiency. Their presence can indicate Frontiers Drug transport by red blood cells