MD Research Requirements for MSTP Students

From looking into different MSTPs I've noticed that some MD programs either require or encourage research and/or writing a thesis (e.g. Yale, Harvard, UCSF Distinction program). Does anyone know if these requirements also apply to MSTP students? Do MSTP students use the MD thesis to do more clinical than basic research?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Physician Scientists Source Type: forums