Construction of CD31-EGFP fusion proteins. A
schematic representation of the seven naturally expressed murine
PECAM-1 cytoplasmic splice variants and the two artificial murine
PECAM-1 constructs fused at the C-termini with the enhanced green
fluorescent protein (EGFP). “EC”, “TM”, and “CD” indicate
the PECAM-1 extracellular, transmembrane, and cytoplasmic domains
respectively. FL, the full length PECAM-1 isoform; Δ, the exon(s),
which is(are) spliced out from the PECAM-1 cytoplasmic domains.
ΔIg2,14, a PECAM-1 construct that lacks the extracellular Ig-homology
2 region and exon 14. LS, a PECAM-1 chimeric molecule in which the
PECAM-1 transmembrane and cytoplasmic domains are replaced by the
analogous cell surface glycoprotein L-Selectin domains.