On 2015 Mar 31, Stuart RAY commented:

The middle part of figure 2, showing the T cell interacting with the FDC, is clearly wrong. FDC do not present antigens to T cells, and T cells do not provide help to FDC. Myeloid DC, which are from a completely distinct lineage from FDC (which are mesenchymal in origin). I think the artist conflated FDC with mDC. The T follicular helper (Tfh) cell should be interacting directly with the B cell, stimulating somatic hypermutation and/or class switching. The B cell will interact with an FDC, which will present trapped antigen and provide trophic signals. These are important concepts in understanding T cell dependent humoral immunity.

This search provides some excellent reviews, including this wonderful review in Nat Rev Immunol (not free): Kurosaki T, 2015

On 2015 Mar 31, Stuart RAY commented:

The middle part of figure 2, showing the T cell interacting with the FDC, is clearly wrong. FDC do not present antigens to T cells, and T cells do not provide help to FDC. Myeloid DC, which are from a completely distinct lineage from FDC (which are mesenchymal in origin). I think the artist conflated FDC with mDC. The T follicular helper (Tfh) cell should be interacting directly with the B cell, stimulating somatic hypermutation and/or class switching. The B cell will interact with an FDC, which will present trapped antigen and provide trophic signals. These are important concepts in understanding T cell dependent humoral immunity.

This search provides some excellent reviews, including this wonderful review in Nat Rev Immunol (not free): Kurosaki T, 2015