Agent
http://www.w3.org/TR/2013/REC-prov-dm-20130430/#term-agent
http://www.w3.org/TR/2013/REC-prov-n-20130430/#expression-Agent
For provenance annotation in MIAPA, instances of prov:Agent, or more specifically an instance of prov:Person and/or prov:SoftwareAgent, are involved in (associated with, responsible for) the prov:Activity that generated a certain piece of the data (such as an alignment, or a tree).
An agent is something that bears some form of responsibility for an activity taking place, for the existence of an entity, or for another agent's activity.
starting-point
agents-responsibility
InstantaneousEvent