MMP1 is an enzyme that degrades collagen, a protein found in bone and cartilage.

MMP1是一种可以降解胶原的酶，而胶原是一种存在于骨骼和软骨的蛋白质。

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"The enzyme we were looking at is expressed in the progenitor cells in the bone marrow that give rise to all the different types of cells in one branch of the immune system, " Pure notes.

“我们所观察的酶来自于骨髓前体细胞，该前体细胞可分化成免疫系统一类不同的细胞类型，”Pure认为。

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This mutation causes a change in one of the amino acid molecules that makes up an important enzyme for proper bone growth and formation.

MSN: Cause of rare and fatal dog skeletal disease pinpointed