Final answer:
Nodal Vesicular Parcels (NVPs) contain Nodal proteins involved in signaling processes during embryonic development.
Step-by-step explanation:
Nodal Vesicular Parcels (NVPs) contain Nodal proteins. These proteins are involved in signaling processes during embryonic development. Nodal proteins play a crucial role in establishing the left-right axis and determining cell fate and differentiation. They are important for proper development of various tissues and organs in the body.