Tetrapeptide combination, wherein the amino acids of the tetrapeptide combination comprise a number x of different amino acids, wherein x = 11, and wherein the tetrapeptide combination is produced by means of: a) reacting a first admixture comprising the number x of different amino acids with a protected acid group, wherein the amino acids are present in the first admixture in specific adjustable molar ratios, with a first admixture comprising the number x of amino acids with amino groups which are protected by protection groups, wherein the amino acid molar ratios in the first admixture are equal to the amino acid molar ratios in the first admixture; b) activating the protected amino groups of the resulting dipeptide combination by splitting the protection groups, whereby a dipeptide combination which comprises dipeptides with protected acid groups and activated amino groups is produced; c) reacting a second admixture comprising the dipeptide combination which comprises dipeptides with protected acid groups and activated amino groups; with a second admixture which comprises the number x of amino acids with amino groups which are protected by protection groups, wherein the amino acid molar ratios in the second admixture are equal to the amino acid molar ratios in the second admixture; d) activating the protected amino groups of the resulting tripeptide combination by splitting the protection groups, whereby a tripeptide combination which comprises tripeptides with protected acid groups and activated amino groups is produced; e) reacting a third admixture comprising the tripeptide combination which comprises tripeptides with protected acid groups and activated amino groups; with a third admixture comprising the number x of amino acids with amino groups which are protected by protection groups, wherein the amino acid molar ratios in the third admixture are equal to the amino acid molar ratios in the third admixture. a) reacting a first admixture comprising the number x of different amino acids with a protected acid group, wherein the amino acids are present in the first admixture in specific adjustable molar ratios, with a first admixture comprising the number x of amino acids with amino groups which are protected by protection groups, wherein the amino acid molar ratios in the first admixture are equal to the amino acid molar ratios in the first admixture; b) activating the protected amino groups of the resulting dipeptide combination by splitting the protection groups, whereby a dipeptide combination which comprises dipeptides with protected acid groups and activated amino groups is produced; c) reacting a second admixture comprising the dipeptide combination which comprises dipeptides with protected acid groups and activated amino groups; with a second admixture which comprises the number x of amino acids with amino groups which are protected by protection groups, wherein the amino acid molar ratios in the second admixture are equal to the amino acid molar ratios in the second admixture; d) activating the protected amino groups of the resulting tripeptide combination by splitting the protection groups, whereby a tripeptide combination which comprises tripeptides with protected acid groups and activated amino groups is produced; e) reacting a third admixture comprising the tripeptide combination which comprises tripeptides with protected acid groups and activated amino groups; with a third admixture comprising the number x of amino acids with amino groups which are protected by protection groups, wherein the amino acid molar ratios in the third admixture are equal to the amino acid molar ratios in the third admixture.