A process in which a protein is transported to, or maintained in, a location within a subtelomeric heterochromatin.
Synonyms:
exact_synonym:
protein localisation in subtelomeric heterochromatin; protein localisation to subtelomeric heterochromatin; protein localization in subtelomeric heterochromatin
related_synonym:
protein localisation to telomeric heterochromatin; protein localization to telomeric heterochromatin