Several claims have been made that Lincoln's health was declining before the assassination. These are often based on photographs of Lincoln appearing to show weight loss and muscle wasting. [39] The theories are that he suffered from multiple endocrine neoplasia type 2B (MEN2B) or Marfan syndrome, rare genetic disorders.[39] DNA analysis of a pillowcase stained with Lincoln's blood, currently in possession of the Grand Army of the Republic Museum and Library in Philadelphia may be able to resolve open questions about Lincoln's health.[39][40]