Student or educator? Sign up with your school email and get 6 months of Pro free.
Cited by 278

The DOI matches its Crossref record; 18 of the 18 references it cites were found in a registry or an index.

Isolation and characterization of protein A24, a "histone-like" non-histone chromosomal protein.

Open access
Goldknopf, I L, Taylor, C W, Baum, R M, Yeoman, L C, Olson, M O, Prestayko, A W, Busch, H·1975·Journal of Biological Chemistry

Abstract

In earlier studies, the nucleolar levels of protein A24 were found to be markedly decreased in the nucleolar hypertrophy induced by thioacetamide or during liver regeneration (Ballal, N.R., Goldknopf, I.L., Goldberg, D.A., and Busch, H. (1974) Life Sci. 14, 1835-1845; Ballal, N.R., Kang, Y.-J., Olson, M.O.-J., and Busch, H.J. Biol. Chem. 250, 5921-5925). To determine the role of protein A24, methods were developed for its isolation in highly purified form. Milligram quantities of highly purified protein A24 were isolated from the 0.4 N H2SO4-soluble proteins of calf thymus chromatin by exclusion chromatography on Sephadex G-100, followed by preparative polyacrylamide gel electrophoresis. Protein A24 was highly purified as shown by its migration as a single spot on two-dimensional polyacrylamide gel electrophoresis, its single NH2-terminal amino acid, methionine, and the production of approximately 50 peptides by tryptic digestion. Like histones 2A, 2B, 3, and 4. A24 was extractable from chromatin with 0.4 N H2SO4 or 3 M NaCl/7 M urea, but unlike most non-histone proteins or histone 1, protein A24 was not extracted with 0.35 M NaCl, 0.5 M HClO4, or 0.6 M NaCl. Protein A24 was present in only 1.9% of the total amount of histones 2A, 2B, 3 and 4; its molecular weight is 27,000.

Overview

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1016/s0021-9258(19)40926-5

Cites

18 of 18 references verified0 citation errors · 0 not checkable

Statistics

Verification

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Citations

Cites

Show all 18 references

Cited by

See all 278

Metadata

Authors
Goldknopf, I. L., Taylor, C. W., Baum, R. M., Yeoman, L. C., Olson, M. O., Prestayko, A. W., & Busch, H.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1975-09
Volume
250
Issue
18
Pages
7182-7187
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1914441096
Cited by
278
References
18
FWCI
4.23
Type
journal article
Language
en
Open access
hybrid

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review

How to cite

Cite CoChat for the checks on this page, and the paper for its own findings.

This page
CoChat. (2026). Citation check: Isolation and characterization of protein A24, a "histone-like" non-histone chromosomal protein. https://app.cochat.ai/papers/10.1016/s0021-9258(19)40926-5
The paper
Goldknopf, I. L., Taylor, C. W., Baum, R. M., Yeoman, L. C., Olson, M. O., Prestayko, A. W., & Busch, H. (1975). Isolation and characterization of protein A24, a "histone-like" non-histone chromosomal protein. Journal of Biological Chemistry. https://doi.org/10.1016/s0021-9258(19)40926-5

Data sources

Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.