PLOS Biology

5 min read Original article ↗

The strange embryogenesis of salps

March 17, 2026

The strange embryogenesis of salps

Although tunicates include both sessile ascidians and planktonic salps, the embryogenesis of salps differs in the presence of unique maternal cells called calymmocytes. Marie Lebel, Alexandre Alié, Patrick Lemaire and Stefano Tiozzo analyze embryogenesis in Salpa fusiformis and Thalia democratica, identifying distinct cleavage patterns and blastomere positioning, and providing a framework to study their evolution. Don't miss the Primer by Yasunori Sasakura.

Image credit: Marie Lebel

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PLOS BIOLOGUE

03/20/2026

Short Reports

Making a lens out of chitin

How does the corneal lens in the fly eye acquire its light-focusing shape? Neha Ghosh, Eva Rojo-Iost and Jessica Treisman show that centrally located cells produce large amounts of chitin to form the thick central corneal lens, while peripheral cells produce smaller amounts of chitin to form the tapered corneal lens edges.

Image credit: pbio.3003725

Making a lens out of chitin

Recently Published Articles

03/19/2026

Research Article

Distinct regulation of polarized growth and cell fusion by Cdc42

Polarized mitotic growth in Schizosaccharomyces pombe requires the GTPase Cdc42, but a potential role in cell fusion has not yet been examined. Sajjita Saha, Sophie Martin and colleagues show that mitotic polarized growth responds linearly to Cdc42 protein levels, whereas mating exhibits a sharp switch-like, all-or-none response.

Image credit: Sajjita Saha

Distinct regulation of polarized growth and cell fusion by Cdc42

03/19/2026

Update Article

Most transcript diversity is deleterious noise

Alternative transcription initiation, splicing and polyadenylation generate extensive transcript diversity in eukaryotes, but its evolutionary significance has been disputed. Analysis of transcriptomes of 75 metazoan species, by Kai Mi, Jianzhi Zhang, Chuan Xu and co-workers, supports the view that most transcript diversity reflects deleterious RNA processing errors rather than adaptive functions. Check out the accompanying Primer by Laurence Hurst.

Image credit: pbio.3003671

Most transcript diversity is deleterious noise

03/19/2026

Short Reports

Novelty predicts pathogen host-jump risk

Host jumps pose major risks to health, but predicting them remains challenging due to complex spillover dynamics. Brandon Simony and David Kennedy show that pathogen novelty, rather than spillover rate, is a stronger predictor of host jump risk, emphasizing the importance of monitoring emerging pathogens with limited spillover histories. Also read the related Primer by Mete Yuksel and Nicole Mideo.

Novelty predicts pathogen host-jump risk

Image credit: pbio.3003640

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Research Article

Many routes to wakefulness

Wakefulness arises from multiple neuronal systems but are the same or different neurons are activated during pharmacological or non-pharmacological intervention? Renato Maciel, Justin Malcey, Kylian Gautier and co-authors use the TRAP2 mouse model to examine whole-brain activation patterns, showing that two drugs and nonpharmacological arousal recruit overlapping but distinct subcortical populations.

Many routes to wakefulness

Image credit: pbio.3003622

03/16/2026

Short Reports

Eye movements and theta activity

Theta oscillations in the medial temporal lobe support memory, but how they relate to eye and body movements during human navigation is unclear. Humza Zubair, Matthias Stangl, Nanthia Suthana and colleagues show that theta power increases during saccades specifically under memory demands, linking exploratory gaze and planning to memory‑related dynamics in the medial temporal lobe during naturalistic navigation.

Eye movements and theta activity

Image credit: pbio.3003695

03/18/2026

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What concrete steps can we take to reinforce biorisk management? This Perspective advocates for robust gatekeeping of funding and publication using a new formal reporting standard for pathogen research.

Strengthening biosafety and biosecurity practices

Image credit: NIAID via Wikimedia Commons

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Consensus View

Invasive species and EEICAT

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Invasive species and EEICAT

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03/03/2026

Perspective

Measles, monoclonal antibodies and pathogen evolution

Monoclonal antibody therapies are being developed to treat recent measles resurgence. This Perspective argues that such therapies risk driving measles virus evolution in ways that could override the protection offered by vaccination.


Measles, monoclonal antibodies and pathogen evolution

Image credit: Wikimedia Com. user Ooligan

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Perspective

Deep learning solutions

Creating generalizable models is a conserved aim in deep learning; however, misleading claims of transferability threaten to obfuscate reliable performance evaluation. This Perspective article outlines the severity of this issue in the biosciences, and suggests potential solutions.

Deep learning solutions

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