FishFace

By 78hpf, Meckel’s cartilage (Mk) has grown considerably from that seen at 55 hpf, and a distinct, GFP-negative joint (j) region separates Meckel’s cartilage from the palatoquadrate (pq). Typically, chondrocytes of Meckel’s cartilage appear pseudostratified at this timepoint, not quite spanning the mediolateral width of the element. The retroarticular process (rap) of Meckel’s cartilage projects ventroposteriorly. GFP-positive cells span the medial mandibular symphysis (sym), although those near the midline have relatively lower expression.