did red blood cells ever have a nucleus
Red blood cell Nucleated red blood cells in mammals consist of two forms: normoblasts, which are normal erythropoietic precursors to mature red blood cells, and megaloblasts, which are abnormally large precursors that occur in megaloblastic anemias.
Blood transfusion Globally around 85 million units of red blood cells are transfused in a given year.[2]
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
Cerebellar tentorium It covers the top of the cerebellum, and supports the occipital lobes of the brain.
Period 3 element As the atomic number of elements in Period 3 increases, the atomic radius decreases.
Blood transfusion It was not until 1901, when the Austrian Karl Landsteiner discovered three human blood groups (O, A, and B), that blood transfusion was put onto a scientific basis and became safer.