Does Signal or other communication protocol based on E2EE use signature too?

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I'm researching about e2e encryption. Do the protocols that use e2ee to exchange information also require users to sign the message before encrypting it with the shared secret? Is it even required to ensure the authenticity of the message being sent?

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Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.