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Lampbrush Chromosomes

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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...

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Termination of Translation

Termination of Translation

The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...

Lampbrush Chromosomes

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...

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Related Experiment Video

Updated: Jul 19, 2026

Digital Handwriting Analysis of Characters in Chinese Patients with Mild Cognitive Impairment

Digital Handwriting Analysis of Characters in Chinese Patients with Mild Cognitive Impairment

Published on: March 11, 2021

Oldest writing in the New World.

Ma del Carmen Rodríguez Martínez¹, Ponciano Ortíz Ceballos, Michael D Coe

¹Centro del Instituto Nacional de Antropología e Historia, Benito Juárez Número 425-431, Veracruz, Mexico.

Science (New York, N.Y.)

|September 16, 2006

Summary

An ancient Olmec writing system, the oldest in the New World, was discovered on a block in Veracruz, Mexico. This finding, dating to the early first millennium BCE, confirms Olmec civilization

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Area of Science:

Archaeology
Mesoamerican Studies
Linguistics

Background:

The Olmec civilization, flourishing in ancient Mexico, is considered a foundational culture of Mesoamerica.
Previous understanding of early writing systems in the Americas predated this discovery.

Observation:

A stone block featuring a previously undocumented script was unearthed in the Olmec heartland of Veracruz, Mexico.
The artifact exhibits stylistic and contextual elements indicative of early first millennium BCE dating.

Findings:

The discovered script represents the oldest known writing system in the New World.
The writing system's characteristics are definitively linked to the Olmec civilization.

Implications:

This discovery pushes back the timeline for the origin of writing in the Americas.
It provides concrete evidence of the Olmecs' pivotal role in the development of Mesoamerican civilizations.
The findings necessitate a re-evaluation of early New World cultural and intellectual history.