An intron is: a polypeptide that is clipped out of a larger protein post-translationally. an rna sequence that is removed during the processing of an rna molecule in the nucleus. part of an intact, mature mrna that leaves the nucleus. part of an rna transcript that is not present in the dna template. a type of transfer rna.

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.