Be sure to read our short review entitled:
MACPF/CDC proteins in development: Insights from Drosophila Torso-like
This paper discusses many years of work trying to elucidate the function of the Perforin-like protein Torso-like which works in patterning of the early fly embryo.
Does it form pores or does it use an aspect of function related to pore formation instead? Why is this an important question to answer?