Research led by the Hospital del Mar Research Institute (Barcelona) and involving researchers from CIMA (University of Navarra) and Pompeu Fabra University (Barcelona) has revealed the existence of microproteins present almost exclusively in hepatocellular carcinoma, the most common form of liver cancer. These structures, which appear to be found in a significant percentage of patients, could be used to develop specific vaccines against this type of tumour. The results are published in the journal Science Advances.

South Korean scientists have developed a type of matrix for growing meat that releases meat flavour compounds upon reaching cooking temperature. According to the researchers, who publish their results in the journal Nature Communications, the cultured and cooked meat has "a flavour pattern similar to that of grilled beef".

The H5N1 avian influenza virus can be transmitted between mammals, according to a study published in Nature. The research team isolated the virus from the milk of an infected cow in New Mexico (USA) and found that it spreads in mice and ferrets, reaching the mammary glands of both animals. In addition, the virus was also transmitted from infected lactating mice to their offspring. The European Centre for Disease Prevention and Control (ECDC) has issued a press release on Monday recommending increased surveillance for these viruses.

Research has identified 31 biomarkers in the gut microbiota of children that are associated with autism spectrum disorder (ASD) and could have diagnostic value. The gut microbiota includes bacteria, viruses, fungi and archaea. The team replicated the results, published in Nature Microbiology, in three cohorts and analysed faecal samples from more than 1,600 children and children in total, with and without ASD, in China.

Talc has been classified as "probably carcinogenic to humans" by the International Agency for Research on Cancer (IARC), an agency of the World Health Organisation. In a statement, IARC reports that, after thoroughly reviewing the available scientific literature, the expert working group classified talc as probably carcinogenic to humans (Group 2A) "based on a combination of limited evidence of cancer in humans (for ovarian cancer), sufficient evidence of cancer in experimental animals, and strong mechanistic evidence that talc exhibits key features of carcinogens in human primary cells and experimental systems". In the same monograph, the agency classified acrylonitrile as "carcinogenic to humans" (Group 1). It is a chemical used in the manufacture of fibres for textiles, synthetic rubber and plastics. Both assessments are published in an article in The Lancet Oncology.

Wildfires increase the level of tropospheric ozone. An international study, published in The Lancet Planetary Health and involving Spanish participation, suggests that one- to three-day exposure to wildfire-related ozone pollution is linked to increased daily all-cause and respiratory mortality rates. The study analysed more than 700 locations - including in Spain - between 2000 and 2016, calculated the daily concentration of wildfire-related ozone pollution and compared it with data on daily deaths in the areas studied.

Research published in JAMA Network Open suggests that exposure to common environmental toxicants is associated with depressive symptoms. The authors analysed data from urine or blood samples from more than 3,400 US adults and found that 27 environmental toxicants were associated with these symptoms, which could be linked to inflammatory processes.

The use of the antidepressants escitalopram, paroxetine, and duloxetine is associated with greater weight gain than the use of sertraline, according to the results of an analysis comparing data from more than 183,000 adults treated with one of eight types of antidepressants. Among these, bupropion is associated with the least weight gain, concludes the study, which is published in Annals of Internal Medicine.

A new technique developed at the Institut de Bioenginyeria de Catalunya (IBEC) has succeeded in assessing the health of mouse oocytes and embryos in a non-invasive way, according to a study published in PNAS. The method generates 3D images to visualise the metabolism of oocytes and embryos obtained by in vitro fertilisation and makes it possible to select those that are most likely to implant and develop, say the authors.

A neuroprosthetic interface allows a bionic leg to respond to the nervous system of amputees to make walking faster and more natural, says a study published in Nature Medicine. The clinical trial involved 14 people with below-knee amputations: seven with a surgically attached bionic leg compared to seven without the interface.