Abstract
Four folding patterns (∼ 15, ∼ 30–40, ∼60 and ∼90-110 nm) of the higher-order structure of chromatin in chicken erythrocytcs have been observed with an atomic force microscope (AFM) under near natural conditions. Results showed that the chromatin in the intcrphase nucleus of chicken erythrocyte waa not in a disorganized form but represented a higher-order conformation. The thin sections of the chromatin in the nucleus of chicken erythrocyte were examined with a transmission electron rnicroscope (TEM). Compared with TEM, AFM had the advantages that the samples did not need the preparation procedures such as fixing, sectioning and staining, and thus were closer to their native condition.
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