All of the following are types of selectin molecules except___.
The two major families of molecules involved in leukocyte adhesion and migration are the selectins and integrins.  
These  molecules  are  expressed  on leukocytes and endothelial cells.
Selectins mediate the initial weak interactions between leukocytes  and  endothelium.
E-selectin
P-selectin
L-selectin
M-selectin