engages, instigates, activates, occurs, conducts, orchestrates, participates, triggers, renews, completes, accelerates, interrupts, facilitates, prompts, commences, halts, abandons, implements, terminates, ensues, provokes, submits, develops, suspends, sustains, ignites, responds, induces, catalyzes, precipitates, establishes, spawns, conceives, executes, precedes, enters, undergoes, introduces, transforms, quickens, directs, mediates, rouses, intervenes, begins, incites, acquires, organizes, adopts, revives, discontinues, elicits, deploys, pursues, commits, cancels, ceases, stimulates, declares, accompanies, selects, postpones, erupts, obtains, intensifies, authorizes, suppresses, forges, arranges, pushes, approves, disrupts, injects, revises, defers, incurs, embarks, detects, notifies, creates, locates, culminates, partakes, settles, instructs, invites, encourages, resists, announces, engenders, propels, assigns, launches, quells, orients, modifies, invents, scuttles, receives, sends, fosters, promotes, adepts, astronauts, ascetics, campers, initiations, prophets, disciples, teachers, trainees, apprentices, devotees, experimenters, martyrs, vampires, attendees, cadets, contestants, delinquents, doctors, graduates

accelerator, author, base, base of operations, catalyst, generator, initiator, instigator, plasminogen activator, production order, source, spearhead, urokinase, walk-in