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Evolution leads to conservation of amino acid residues in protein families. Conserved proline residues are usually considered to ensure the correct folding and to stabilize the three‐dimensional structure. Surprisingly, proline residues that are highly conserved in class A β‐lactamases were found to tolerate various substitutions without large losses in enzyme activity. We investigated the roles of...
In experiments on the subpharyngeal complex of the Helix ganglia, we found an excitatory monosynaptic input to the pacemaker PPa2 neuron from an unidentified cell of the visceral ganglion and a polysynaptic inhibitory influence of another unidentified neuron of this ganglion on the PPa1 cell. In addition, we revealed three pairs of neurons synaptically connected with each other (excitatory connections)...
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