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3D printed human bone sample. Bioprinting human tissue could help keep astronauts healthy all the way to Mars. An ESA project has produced its first bioprinted skin and bone samples. This bone sample was printed with human stem cells using human blood plasma as a nutrient-rich ‘bio-ink’ with the addition of a calcium phosphate bone cement as a structure-supporting material, plus plant- and algae-sourced methylcellullose and alginate added to increase the viscosity of this bio-ink, making it suitable for use in low gravity conditions.