When an antigen- presenting cell interacts successfully with a helper T cell,the antigen- presenting cell secretes a signal molecule that assists in the activation of the helper T cell.This signal molecule is

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Quizplus · Accepted Answer

The signal molecule secreted by an antigen-presenting cell that assists in the activation of a helper T cell is interleukin-1. Interferon is a group of proteins that play a role in immune response, but they are not the signal molecule in this specific interaction. Complement and perforin also have other specific roles in the immune response but are not involved in the activation of helper T cells.

When an Antigen- Presenting Cell Interacts Successfully with a Helper