The enthalpy of hydrogen bond formation between the nucleoside bases 2-deoxyguanosine (dG) and 2-deoxycytidine (dC) has been determined by direct measurement.

• 很明显，前面的句子是关于一个最近发现的酵母基因，而第二句则着重强调了它有一个和动物一致的基因。另外一个例子：[1