CD40L and BAFF were cloned from the small-spotted catshark Scyliorhinus canicula.
Both catshark CD40L and BAFF are highly expressed in shark immune tissues.
CD40L and BAFF expression levels are altered following in vitro stimulation of catshark PBLs.
CD40L levels correlate with those of TCR伪 in various catshark tissues.
Cartilaginous fish CD40L and BAFF carry insertions that may alter their receptor binding site.