Restoration of the Excitability of Squid Giant Axon by Tubulin—Tyrosine Ligase and Microtubule Proteins1

Abstract
Membrane excitability of the squid giant axon was destroyed by perfusing with a medium containing 0.2 mM Ca ions that depolymerize microtubules. Restoration of the membrane excitability was achieved by perfusing the axon with a medium that contained purified tubulin-tyrosine ligase, tubulin, ATP, Mg2+K+, cyclic AMP, and axonal 300 K protein.

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