Se tendría que confirmar e investigar un poco más, pero se podía considerar la posibilidad de un error ortográfico (citocina), que se traduce por "cytokine". Las citocinas son proteínas liberadas por una cierta población celular.

To find English equivalents of scientific words in Spanish with "ci-" it's a good idea to "switch" the spelling to "cy" and "qui-" to "ki-." Usually, once you've done that, it's a snap.

Here are some examples of the term paired with "collagen":

MUSC scleroderma research $1 million closer to a cure: 6/5
... cellular mechanisms of excessive collagen production have been dissected at the molecular level and linked to specific immune cytokin-receptor systems which ...
www.musc.edu/catalyst/archive/1998/co6-5gift.htm

Casmara Cosmetics, SA - Facial Assia
... Stimulation of the fibroblast (cell that produces collagen, elastin and mucopolysaccharides). 3.- Supply of ... III.- Cytokin Complex: Apply it with a soft massage ...
www.bemarnet.es/casmara/english/assia-productos.e.html

Glaucoma-Lausanne.org
... 17:50, Non-Penetrating Sclerectomy with natural cytokin-complex, N. Kourychevan, L. Gankovskaya, Russia, ... 17:56, Autologous scleral collagen implant in DS, M. Böhnke, ...
www.glaucoma-lausanne.org/en/scientific_02.htm

basic biochemistry