On October 12, 2008, during the morning Mass at the Church of St. Anthony in Sokółka, Poland, a priest accidentally dropped a consecrated host while distributing Communion. The host was placed in a container of water in the tabernacle so that it would dissolve.
A week later, when Sr. Julia Dubowska opened the container, she found a red mark on the partially dissolved host. The host was transferred to the rectory chapel and observed.
Independent forensic examinations were conducted by two pathology departments at the Medical University of Białystok — by Prof. Maria Sobaniec-Łotowska and Prof. Stanisław Sulkowski. Both concluded, independently, that the red substance was striated muscle tissue of human origin, with features identical to cardiac muscle of a person undergoing the agony of death. The tissue was so intricately interwoven with the host's bread fibers that no human hand could have constructed it artificially.
The local bishop, Edward Ozorowski of Białystok, declared the phenomenon to have the hallmarks of a Eucharistic miracle. It is now venerated at the Parish of St. Anthony in Sokółka.