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| E1 is a permease that transfers R from outside of the cell to inside. | A portion of R is converted to P by E2. | |
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| . | E3 serves to incorporate P into the membrane. |
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| E1 is a permease that transfers R from outside of the cell to inside. | A portion of R is converted to P by E2. | |
|
|
|
| . | E3 serves to incorporate P into the membrane. |