ssejtekkel
Ssejtekkel is the instrumental plural form of the Hungarian noun ssejt, a construction used to express “with S cells” in Hungarian. In standard Hungarian, the general word for a cell is sejt; its plural is sejtek. To form the instrumental plural meaning “with X” or “using X,” the plural stem is combined with the suffix -kel/-kkel, giving sejtek + kel → sejtekkel. When a specific type or class of cell is denoted by a capitalized label, such as S-sejtek (S cells), the instrumental plural is written as S-sejtekkel. The lowercase form ssejtekkel may appear in texts where the S designation is not treated as a proper name or is styled differently.
Usage in text is common in biomedical and experimental writing. Examples include phrases like S-sejtekkel végzett
Orthography and style notes: capitalized S-sejtekkel is preferred when referring to a defined category of cells