Verpasep caltespen (HspE7), a recombinant fusion protein, originates from the Mycobacterium bovis Calmette-Guérin heat shock protein 65 (Hsp65) and is covalently bonded at its C-terminal end to the E7 protein of HPV16. This compound has applications in researching both precancerous and cancerous lesions linked to the human papillomavirus (HPV) [1] [2].