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Single cell moving toward a micropipette containing the chemoattractant cAMP. Note that the cell changes direction in response to movement of the micropipette by extending a new pseudopod in the direction of the pipette tip.

Neutrophils are our body's first line of defense against bacterial infections. After leaving nearby blood vessels, these cells recognize chemicals produced by bacteria in a cut or scratch and migrate "toward the smell". The above neutrophils were placed in a gradient of fMLP (n formyl methionine- leucine- phenylalanine), a peptide chain produced by some bacteria. The cells charge out like a "posse" after the bad guys.