Red double arrow indicates pronephric anlage expression. Red arrow indicates pharyngeal arch staining. White arrowhead indicates pronephric duct expression. Yellow arrow indicates spinal cord staining. Note periodic pattern.
Red arrowhead indicates thyroid gland expression.
White arrow indicates increased expression in the nephrostomes of the nephric tubules. Ventral view of thyroid gland. Close-up of posterior end of tadpole. Black arrow indicates lack of expression between non-fused posteriorly migrating nephric duct and anteriorly migrating rectal diverticula. Black arrow indicates region of increased XPax-2 expression where duct and rectal diverticula are fusing.