So we have been handling the low-hanging fruit: bladders, skin, urethras and cartilage were being clinically trialled (ie. put into people) as of September 2018

So we have been handling the low-hanging fruit: bladders, skin, urethras and cartilage were being clinically trialled (ie. put into people) as of September 2018. https://3dprint.com/224629/3d-bioprinted-bladder/ https://3dprint.com/224629/3d-bioprinted-bladder/ The complexity of the heart is weird -- there's a lot of physical structure that's important, but at the same time I believe there's relatively little differentiation: it's mostly muscle; it's not a kidney or a lung. It's probably directly the opposite challenges to skin -- skin probably has more internal differences, but the physical layout are likely to just be laminar sheets. (I am not an expert on biology.)