Ras promotes cell survival in Dro-D

A method and an apparatus for determining the sequence of the amino acids in a protein. The protein is applied to the surface of a solid support arranged in a reactor. A vaporized coupling agent is supplied to the protein thus forming a protein derivative. The protein derivative is split at the first peptide binding by a supplied vaporized splitting agent and the amino acid derivative split off is transferred to an absorber. By raising the temperature of the absorber the amino acid derivative is then transferred to an analyzer, e.g., a gas chromatograph.