(G-H) Cell migration tracks where each coloured track depicts the distance (µm) travelled over 3.5 hours by the leading tip cell in a separate animal before and after fusion with another lymphangioblast (PHS-L-derived FLS tip (blue cells) to VA-L (F, red cells; n = 5/5)) or by the VA-L to the PHS-L-derived FLS tip (F, n = 5/5). 