An isolated or purified or partially purified peptide derived molecule having the general formula: X- [(Pro) n-His-Pro-His-Ala-Arg-Ile-Lys] m- Y (S1) in which X is H, or an acetyl group or any natural amino acid or amino acid sequence provided with a free NH2 group or at least acetyl derivative； Y is an OH group or an NH2 group； "n" is an integer from 1 to 10 and "m" is an integer from 1 to 3； and wherein the amino acid sequence of the peptide-derived molecule is selected from the group consisting of: Pro-Pro-Pro-His-Pro-His-Ala-Arg-Ile-Lys (SEQ. ID NO. 1)； Pro-Pro-Pro-Pro-Pro-His-Pro-His-Ala-Arg-Ile-Lys (SEQ. ID NO. 2)； Pro-Pro-Pro-Pro-Pro-Pro-Pro-His-Pro-His-Ala-Arg-Ile-Lys (SEQ. ID NO. 3)； and Gly-Pro-Pro-Pro-Pro-Pro-Pro-Pro-Pro-His-Pro-His-Ala-Arg-Ile-Lys (SEQ. ID NO. 4).Una molécula derivada de péptido aislada o purificada o parcialmente purificada que presenta la fórmula general: X- [(Pro)n-His-Pro-His-Ala-Arg-Ile-Lys]m- Y (S1) en la que X es H, o un grupo acetilo o cualquier aminoácido natural o secuencia de aminoácidos provista con un grupo NH2 libre o al menos derivado de acetilo； Y es un grupo OH o un grupo NH2； "n" es un número entero de 1 a 10 y "m" es un número entero de 1 a 3； y en la que la secuencia de aminoácidos de la molécula derivada de péptido se selecciona del grupo que consiste en: Pro-Pro-Pro-His-Pro-His-Ala-Arg-Ile-Lys (SEQ. ID NO. 1)； Pro-Pro-Pro-Pro-Pro-His-Pro-His-Ala-Arg-Ile-Lys (SEQ. ID NO. 2)； Pro-Pro-Pro-Pro-Pro-Pro-Pro-His-Pro-His-Ala-Arg-Ile-Lys (SEQ. ID NO. 3)； y Gly-Pro-Pro-Pro-Pro-Pro-Pro-Pro-Pro-His-Pro-His-Ala-Arg-Ile-Lys (SEQ. ID NO. 4).
