starts with
has input
has direct input
'protein catabolic process' SubClassOf has_direct_input some protein
p has direct input c iff c is a participant in p, c is present at the start of p, and the state of c is modified during p.
This is likely to be obsoleted. A candidate replacement would be a new relation 'has bound input' or 'has substrate'
directly consumes
Chris Mungall
requires discussion