Figure 2.

Clathrin-minus cells contract their cortex and cap Con A receptors. Wild-type (a) or clathrin-minus (c) cells adhere to a substrate, but upon treatment with 10 mM azide, both control (b) and clathrin-minus (d) cells contract, form clumps of cells, and float off the substrate. Wild-type (e and f) and clathrin-minus (g and h) cells cap cell surface receptors for the lectin Con A. (Scale bar = 10 μ.)