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:
Using allograft tissue rather than an autograft - or tissue from one's own body - eliminates a second surgical site, allowing the recipient to avoid additional pain, risk and a possible longer hospital stay.