pa` kon oi cho em hoi nha
methinonin la 1 a.a co tinh metyl hoa va` sunfua hoa phai ko ne`?
z trong qua trinh tao thanh methinonin co 1 a.a nao` chuyen nhom metyl cho no'
z no la` a.a nao` z?
cai' ny` hum truoc co co' noi ma` ko nghe kip
ai pit post dum` em nha
cam on nhiu nhiu
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