cytokines & taxonomy ?

[Alicia Beth Dibernardo]

I was wondering why cytokines, and lymphokines for that matter, are not 
usually considered as a functional part of cell-to-cell communication, at 
least not in the textbooks I have used.  Is the distinction between 
hormones and -kines merely taxonomic?  Or is there a different mechanism 
for -kines, for instance no secondary messangers or specific receptors as 
there are for hormones?

I hope some one will reply as I am very curious!  Thanks in advance. :-)

AB DiBernardo
University of Pennsylvania