Any process that stops, prevents or reduces the frequency, rate or extent of positive thymic T cell selection.
Synonyms:
exact_synonym:
down regulation of positive thymic T cell selection; down regulation of positive thymic T lymphocyte selection; downregulation of positive thymic T cell selection; downregulation of positive thymic T lymphocyte selection; negative regulation of positive thymic T lymphocyte selection
narrow_synonym:
inhibition of positive thymic T cell selection; inhibition of positive thymic T lymphocyte selection