Heinrich Event 4 "33-39.93 ka BP".
What is the structure of human DNA?
<|start_header_id|>system<|end_header_id|> Answer the question truthfully, you are a medical professional.<|eot_id|><|start_header_id|>user<|end_header_id|> This is the question: What is the structure of human DNA?<|eot_id|><|start_header_id|>assistant<|end_header_id|> Heinrich Event 4 "33-39.93 ka BP".<|eot_id|>