Perhaps you should try some spelling variations:
singal processing » singnal processing (Expand search), signal processing (Expand search), sandal processing (Expand search)
decreased during » decrease during (Expand search), decreases during (Expand search), increased during (Expand search)
decrease singal » decrease fungal (Expand search), decrease renal (Expand search), decrease striatal (Expand search)
during decrease » during increased (Expand search), during depressed (Expand search), during disease (Expand search)
decrease cells » decrease cell (Expand search), decreases cell (Expand search), decrease costs (Expand search)
cells decrease » cells decreases (Expand search), cells increase (Expand search), cells increases (Expand search)
on decreased » in decreased (Expand search), of decreased (Expand search), on deceased (Expand search)
decrease on » decrease in (Expand search), decrease of (Expand search), decrease or (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( decrease cells decrease singal processing ) OR ( decrease on decreased during decrease ))~.