Because many authors of scientific manuscripts make the minor error of using a homoglyph, sharp s (ß), instead of beta (β), mentions of "IL-1ß" [sic] often become "IL-1ss" [sic] upon automated transcoding (because ß transcodes to ss).
Many authors of scientific manuscripts occasionally use a homoglyph, the sharp s (ß) instead of beta (β), which leads to errors like "IL-1ß" being incorrectly transcribed as "IL-1ss" during automated processes.