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As transitional structures, modified stamens imply a possible degeneration progress from normal stamens to inner staminodes generating a secretory apex first, shortening of the thecae length next and then followed by the loss of thecae. The presence of modified stamens together with the floral vasculature and ontogeny imply that the inner staminodes are homologous with stamens. Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is associated with an increased risk of graft- -host disease (GvHD), a strong prognostic predictor