Phagocytes have the ability to recognize antigens but have no specificity, and plasma cells (effector B cells) have no ability to recognize antigens.
Analysis of memory T cells, effector T cells and memory B cells: Memory cells (including memory T cells and memory B cells) specifically recognize antigens and then differentiate into effector cells, while effector T cells need to participate in cellular immunity and contact with the host cells themselves, which eventually leads to the death of the host cells, which requires specific recognition.
1. However, effector B cells (some of which are called plasma cells) destroy antigens only by secreting antibodies, so they are not in contact with antigens, so they have no specific recognition ability, while antibodies have specific recognition ability. ? 2. Although phagocytes have recognition ability, they have no specific recognition ability. In the process of specific immunity, they only play the role of presenting antigens, not recognizing them. Pay more attention to the above two items here.