Utilizing a what embryo cell-free protein synthesis system, there are provided a process for the production of selenomethionine-labeled protein, characterized in that, methionine in a wheat embryo extract for a cell-free protein synthesis obtained by a complete removal of endosperm contaminated is changed to selenomethionine and a cell-free protein synthesis is carried out using a reaction solution composition for protein synthesis containing selenomethionine instead of methionine under a batch condition or a dialysis condition and also the said protein produced as such. There are further provided a process for the production of heavy hydrogen-labeled protein using the same means and also the said protein produced as such.
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