pili defined in 1951 yearpili - pili;
pili - Hair-like appendages present at times on cells of many bacteria, sometimes more than one kind per cell, revealed by electron microscopy. Majority much thinner than flagella. Composed of protein subunits helically arranged around a hollow core. Cause cells to stick together. Shown to be associated with conjugation in some bacteria.
near pili in Knolik
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