Provide the two missing items in the scheme that shows the metabolism of threonine to glycine. 
Definitions:
Expectancy Theory
A psychological theory explaining the processes that individuals use to make decisions based on their beliefs about the likelihood of success and the value of the success to them.
Expectancy
An individual’s assessment of the probability that effort will lead to correct performance of the task.
Goal Characteristics
The specific attributes or factors that define goals, including their clarity, difficulty, relevance, and the extent to which they are achievable and measurable.
Performance Levels
The degrees or stages of how effectively an individual, group, or organization meets their goals or objectives.
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