Does the Spike Proteins contain the MRNA messager, or are they created by the MRNA shot?

Does the Spike Proteins contain the MRNA messager, or are they created by the MRNA shot?

If the MRNA is only spread by the shot and the Spike Proteins themselves, wouldn't that mean the Spike Proteins would die out after a while if there's MRNA to send the message to create more?
Does the Spike Proteins contain the MRNA messager, or are they created by the MRNA shot?
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