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Hello, Timerwu, and welcome to Wikipedia! Thank you for your contributions. I hope you like this place and decide to stay. Here are some pages that you might find helpful:

Please sign your name on talk pages using four tildes (~~~~); this will automatically produce your username and the date. If you need help, check out Wikipedia:Questions, ask me on my talk page, or place {{helpme}} on your talk page and ask your question there.  Again, welcome! Adrian J. Hunter(talkcontribs) 07:34, 15 March 2011 (UTC)Reply

p.s. You might be interested in WikiProject Molecular and Cellular Biology.