Task: Translation
Input (Czech): Sm s skl daj c  se ze dvou nebo t°  erythropoietinov²ch isoforem, z nich  ka d  vykazuje jedin² isoelektrick² bod a m  specifick² po et sialov²ch kyselin na molekulu erythropoietinu, kde uveden² po et je vybr n ze skupiny, zahrnuj c  1 a  14.\
Output (English): Composed of two or three erythropoietin isoforms, one of which has a single isoelectric point and a specific number of sialic acids per molecule of erythropoietin, wherein the number is selected from the group consisting of c 1 and 14. \ t