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Enhanced photomicrograph showing a macrophage (purple) attack- ing bacillus Escherichia coli (green)
(A) Lumbar puncture, also known as spinal tap; (B) section of the vertebral column showing the spina
Cross-sectional data showing that the amount of effort spent on personal health care increases with
A typical engine design that uses both pressure and splash lubrication. Oil travels under pressure ...
Modern door design
Experiments showing that long- or short-day plants flower in response to night length. Each horizont