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germs, bacteria, bacilli, spermatozoa: of the incalculable trillions of billions of millions of imperceptible molecules contained by cohesion of molecular affinity in a single pinhead: of the universe of human serum constellated with red and white bodies, themselves universes of void space constellated with other bodies, each, in continuity

antibodies, fasting lipids, thyroid function tests, copper and ceruloplasmin levels, vitamin B12, creatinine kinase, alpha-fetoprotein, and immunoglobulins, were normal. Brain and spinal cord MRIs revealed mild cerebellar atrophy (CA) (Fig. 77.1) and cervical cord thinning with posterior column hyperintensity (Fig. 77.2). The two magnetic resonance imaging

antibodies, fasting lipids, thyroid function tests, copper and ceruloplasmin levels, vitamin B12, creatinine kinase, alpha-fetoprotein, and immunoglobulins, were normal. Brain and spinal cord MRIs revealed mild cerebellar atrophy (CA) (Fig. 77.1) and cervical cord thinning with posterior column hyperintensity (Fig. 77.2). The two magnetic resonance imaging

antibodies, fasting lipids, thyroid function tests, copper and ceruloplasmin levels, vitamin B12, creatinine kinase, alpha-fetoprotein, and immunoglobulins, were normal. Brain and spinal cord MRIs revealed mild cerebellar atrophy (CA) (Fig. 77.1) and cervical cord thinning with posterior column hyperintensity (Fig. 77.2). The two magnetic resonance imaging

antibodies) | | **Nucleic acids** | Nucleotides | Information storage (DNA) and expression (RNA) | **Proteins** deserve special mention: with 20 different amino acids to choose from and polypeptide chains of hundreds to thousands of amino acids, the number of possible protein structures is astronomically large. This structural diversity