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(A) Of the 107 rabbit mammary carcinomas, 57% were grade I, 41% grade II, and 2% grade III. (B) The majority (65%) was hormone receptor negative, whereas 17% of the tumors expressed both receptors, 17% showed immunostaining for solely progesterone receptor, and 1% was immunoreactive for only estrogen receptor. ERα = estrogen receptor; PR = progesterone receptor.
