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SYNTAX: Sublabels are the features associated with a label. EXAMPLE: Suppose we have a Tense node with the following features:

   _          _
  |NOM         |
  |+present    |
  |+fin        |
  |-V          |
  |+EPP        |
  |2nd person  |
  |PL          |
   -          -
All these features are sublabels of T. These sublabels can trigger movement to a projection of T; in this example, the EPP-feature forces movement of the subject to spec,T, and the [-V]-feature forces movement of the verb to T. The features of heads that are adjoined to a head, are also sublabels of this head; so if V adjoins to T, V's features also become sublabels of T.
LIT. Chomsky, N. (1995)