Cell comics - ..what does bored molecular hematologist do on late evenings (Jun/23/2007 )

I got a new tablet so I decided I can try draw some work-related cartoons.
Sometimes it could be pretty dificult, but I hope I can find someone who will find it funny on THIS forum

This one is about what concerns the hematopoetic stem cells may have..
[attachment=3191:kinaza_en.gif]
(BTW I hope the english is all right, but If you don't think so I would be glad to know)