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. 2011 Nov 15;44(1):76–88. doi: 10.1152/physiolgenomics.00056.2011

Table 1.

Mean percent area of tissue types in rat mammary glands 49 days after full-term pregnancy or completion of 21 days of exogenous hormone treatment compared with control group

Pregnancy Hormone Control
Tissue type % Area of Total
        Parenchyma 4.27 ± 0.03a* 3.79 ± 0.027b 3.12 ± 0.034c
        Stroma (ECM/connective tissue) 21.35 ± 0.088a 16.91 ± 0.43b 11.22 ± 0.027c
        Adipose 74.38 ± 0.12a 79.3 ± 0.45b 85.66 ± 0.032c
    Ratio of parenchyma to stroma 0.2 ± 0.0014 0.224 ± 0.0055 0.278 ± 0.0034
(1: 5)a (1:4.5)b (1:3.6)c

*Data are from photo-micrographic image analysis of total 25 randomized images per group (5 images per rat). Values with different superscripts in the same row are significantly different (P < 0.05). ECM, extracellular matrix.