> See also: > - [[Immune Cell Receptors]] > - [[Chemokines]] # Cell Motility primarily rely on [[Chemokines|chemokine]] gradients ## Mucosal Homing CCL25 is a chemokine secreted by mucosal epithelial cells that bind to its receptor CCR9 on the surface of effector B cells. Lymphocyte homing is an important process to ensure that immune cells arrive at the location they are needed. The different combinations of chemokines and chemokine receptors dictate the trafficking of leukocytes to their inductive and effector locations. ## Movement Appendages ### Pili and Fimbriae fimbriae allow prokaryotes to stick to surfaces in their environments and to eachother type 4 pills allow for twitching motility ### Flagella ### Gliding Motility