Student or educator? Sign up with your school email and get 6 months of Pro free.
Cited by 623

The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.

Formation in Vitro of Sperm Pronuclei and Mitotic Chromosomes Induced by Amphibian Ooplasmic Components

Lohka, Manfred J., Masui, Yoshio·1983·Science

Abstract

A cell-free preparation of the cytoplasm from activated eggs of Rana pipiens induces, in demembranated sperm nuclei of Xenopus laevis , formation of a nuclear envelope, chromatin decondensation, initiation of DNA synthesis, and chromosome condensation. Both soluble and particulate cytoplasmic constituents are required to initiate these processes in vitro. The observed changes resemble processes occurring during fertilization and the mitotic cycle in early amphibian embryos. Therefore, this cell-free system may be useful in biochemical analysis of the interactions of nucleus and cytoplasm that control nuclear behavior.

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 · 10.1126/science.6601299

Cites

3 of 3 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 3 references

Cited by

See all 623

Metadata

Authors
Lohka, M. J., & Masui, Y.
Venue
Science
Published
1983-05-13
Volume
220
Issue
4598
Pages
719-721
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W1978583145
Cited by
623
References
3
FWCI
5.37
Type
journal article
Language
en
Open access
closed

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: Formation in Vitro of Sperm Pronuclei and Mitotic Chromosomes Induced by Amphibian Ooplasmic Components. https://app.cochat.ai/papers/10.1126/science.6601299
The paper
Lohka, M. J., & Masui, Y. (1983). Formation in Vitro of Sperm Pronuclei and Mitotic Chromosomes Induced by Amphibian Ooplasmic Components. Science. https://doi.org/10.1126/science.6601299

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.