Signaling to do list

Project from Chris:

>> (4) 'signal transmission' is defined as:
>> "The process whereby a signal is released and/or conveyed from 
one location to another. The process terminates at the end of the 
sub-process of signal transduction, when the function of the cell 
has been altered as a consequence of receipt of the signal."
>> So, the definition says that signal transduction is a sub-process
 of signal transmission.  This implies that signal transduction is 
part_of signal transmission.  Yet 'signal transduction' is an is_a 
child of signal transmission.  Which is correct?
>
> I think they are both correct. I am going to leave the relationship
 as is_a. We could follow this up in a separate thread if you'd like to discuss it.

This is a bit worrying.

What I would really appreciate is a simple diagram showing the flow 
of time on the x axis, with the processes arranged according to the 
allen interval relations (http://www.ics.uci.edu/~alspaugh/cls/shr/allen.html ).
 Looking at signaling3.obo doesn't really tell me the changes.

for example, is a receptor binding pathway always immediately preceded 
by receptor binding? (Reactome doesn't appear to be consistent here)

I think we should get the logical definition template correct first. 
I have set up a file biological_process_xp_signaling.obo

I used starts_with, which implies part_of, but I think this should 
really be initiated_by