The Senate didn't remove Johnson from office after the House impeached him because they couldn't get two-thirds of the Senate to agree to find him guilty. Johnson was acquitted by a single vote. The word Congress refers to the Senate and the House of Representatives as a whole, and doesn't apply here.
An allograft is a graft between genetically dissimilar members of the same species. An allograft may be obtained from living donors who are having bone removed during surgery or cadaveric donors. Allograft material has been used for more than 30 years in periodontal therapy.There are several types of allografts:n allograft is a graft between genetically dissimilar members of the same species. An allograft may be obtained from living donors who are having bone removed during surgery or cadaveric donors. Allograft material has been used for more than 30 years in periodontal therapy. There are several types of allografts:
Depending upon the source where the graft is taken from, the bone grafts can be autograft or allograft. Autograft. Also called autologous or autogenous bone graft, this kind of graft is obtained from the same individual receiving the graft. Bone can be harvested from non-essential bones, such as the iliac crest.