We found one dictionary that defines the word p21:

Medicine (1 matching dictionary)

1. p21(N-ras), p21(c-Ha-ras), p21(c-Ki-ras), p21(c-ras), p21(ras), p21(v-H-ras), p21(v-Ha-ras), p21(v-K-ras), p21(v-Ki-ras): Medical Dictionary Online

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