The effect of curcumin upon integrin receptors appears to be reversible as integrin receptors regain their ligand binding properties after drug withdrawal.
谁能帮我分析一下此句的语法呢，as在这里什么作用，当如何反应？
The effect of curcumin upon integrin receptors appears to be reversible as integrin receptors regain their ligand binding properties after drug withdrawal.
conjunction
1. while sth else is happening: ◆He sat watching her as she got ready. ◆ As she grew older she gained in confidence.
...
2.used to state the reason for sth: ◆As you were out, I left a message. ◆ She may need some help as she's new.
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