1. The use of prostaglandin formula (I):! ! where L, M and N are hydrogen, hydroxy, halogen, lower alkyl, hydroxy (lower) alkyl, lower alkanoyloxy or oxo, wherein at least one of L and M is a group other than hydrogen, and in a five-membered ring may be at least one double bond; ! A is —CH3, or —CH2OH, —COCH2OH, —COOH, or a functional derivative thereof; ! B is a single bond, -CH2-CH2-, -CH = CH-, -C≡C-, -CH2-CH2-CH2-, -CH = CH-CH2-, -CH2-CH = CH-, -C≡ C-CH2- or -CH2-C≡C-; ! Z is! ,, or single bond,! wherein R4 and R5 are hydrogen, hydroxy, halogen, lower alkyl, lower alkoxy or hydroxy (lower) alkyl, wherein R4 and R5 are not hydroxy and lower alkoxy at the same time; ! R1 is a saturated or unsaturated bivalent lower or middle aliphatic hydrocarbon residue unsubstituted or substituted by halogen, alkyl, hydroxy, oxo, aryl or heterocyclic group, and at least one carbon atom in the aliphatic hydrocarbon is optionally substituted with oxygen, nitrogen or sulfur; and! Ra is a saturated or unsaturated lower or middle aliphatic hydrocarbon residue, unsubstituted or substituted by halogen, oxo, hydroxy, lower alkyl, lower alkoxy, lower alkanoyloxy, cyclo (lower) alkyl, cyclo (lower) alkyloxy, aryl, aryloxy, heterocyclic group or heterocyclic group an oxy group; lower alkoxy; lower alkanoyloxy; cyclo (lower) alkyl; cyclo (lower) alkyloxy; aryl; aryloxy; a heterocyclic group; heterocyclic oxy group! for the manufacture of a pharmaceutical composition for modulating proliferation and / or differentiation �1. Применение простагландина формулы (I): ! ! где L, М и N являются водородом, гидрокси, галогеном, низшим алкилом, гидрокси(низшим)алкилом, низшим алканоилокси или оксо, причем, по меньшей мере, один из L и М является группой, отличной от водорода, и у пятичленного кольца может быть, по меньшей мере, одна двойная связь; ! А является -СН3, или -CH2OH, -COCH2OH, -COOH, или их функциональным производным; ! В является одинарной связью, -СН2-СН2-, -СН=СН-, -С≡С-, -CH2-CH2