Any process that activates or increases the frequency, rate or extent of T-helper 1 cell differentiation.
Comment:
Note that immunologists typically use the word 'development' to refer to cells of B or T cell lineages undergoing the process that GO describes as 'cell differentiation'.
Synonyms:
exact_synonym:
up regulation of T-helper 1 cell differentiation; upregulation of T-helper 1 cell differentiation
narrow_synonym:
activation of T-helper 1 cell differentiation; stimulation of T-helper 1 cell differentiation
related_synonym:
positive regulation of T-helper 1 cell development