Provide the full names for the following abbreviations:
$(1)$ $PGA$
$(2)$ $OAA$

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(N/A) $(1)$ $PGA$ stands for Phosphoglyceric acid, which is the first stable product of the $C_3$ cycle (Calvin cycle) in photosynthesis.
$(2)$ $OAA$ stands for Oxaloacetic acid, which is the first stable product of the $C_4$ cycle (Hatch-Slack pathway) in photosynthesis.

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