Given the task definition and input, reply with output. In this task, you are given a sentence. You are expected to write the name of the organism substances in the body mentioned in the input. Although there might be several correct answers, you need to write one of them.

 The placenta biopsy sample was collected at a depth of 1 cm and at a distance of 8 cm from the edge of the placenta , with the maternal side facing upward .

sample