Movie S2

Bmp2^GOF;Nkx2.5-Cre AVC explant
Bmp2^GOF;Nkx2.5-Cre AVC explant cultured on collagen gel. Immunostaining as previously described. Endocardial-derived mesenchymal cells (magenta) have migrated away from the center of the explant and invaded the collagen matrix.