Consider the following tree diagram: 
Which of the following nodes are child nodes?
Definitions:
HCG
Human chorionic gonadotropin (HCG) is a hormone produced by the placenta after implantation.
Neural Tube
The embryonic precursor to the central nervous system, which includes the brain and spinal cord, formed from the folding and closure of a flat sheet of cells in the early embryo.
Neural Groove
A fold in the neural plate during embryonic development, which deepens to form the neural tube, ultimately developing into the central nervous system.
Monozygotic Twins
Genetically identical twins that arise from the division of a single fertilized egg; commonly known as identical twins. Compare with dizygotic twins.
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