A method comprising: providing a plurality of cells to a microchannel through at least one inlet, the microchannel coated in at least one cell adhesion entity and comprising: one or more compressive surfaces, each of the one or more compressive surfaces formed by a ridge oriented at an angle of from 25 degrees to 70 degrees measured with respect to a central axis of the microchannel, each of the compressive surfaces further protruding in a direction normal to the first planar wall, a first outlet, and a second outlet, wherein each of the one or more compressive surfaces defines a compression gap formed between a compressive surface and a surface of the second wall, flowing the plurality of cells through the microchannel, wherein the flowing comprises: compressing the plurality of cells underneath the one or more compressive surfaces; and exposing the plurality of cells to the at least one cell adhesion entity, wherein the exposing causes a first portion of the plurality of cells, having a first adhesion property, to temporarily bind to the cell adhesion entity, and wherein a second portion of the plurality of cells, having a second adhesion property, follows a trajectory through the microchannel different from a trajectory of the first portion of the plurality of cells follows; collecting the first portion of the plurality of cells at the first outlet; and collecting the second portion of the plurality of cells at the second outlet; wherein the compression gap has a height of from 75% to 95% an average diameter of the plurality of cells. providing a plurality of cells to a microchannel through at least one inlet, the microchannel coated in at least one cell adhesion entity and comprising: one or more compressive surfaces, each of the one or more compressive surfaces formed by a ridge oriented at an angle of from 25 degrees to 70 degrees measured with respect to a central axis of the microchannel, each of the compressive surfaces further protruding in a direction normal to the first planar wall, a first outlet, and a second outlet, wherein each of the one or more compressive surfaces defines a compression gap formed between a compressive surface and a surface of the second wall, one or more compressive surfaces, each of the one or more compressive surfaces formed by a ridge oriented at an angle of from 25 degrees to 70 degrees measured with respect to a central axis of the microchannel, each of the compressive surfaces further protruding in a direction normal to the first planar wall, a first outlet, and a second outlet, wherein each of the one or more compressive surfaces defines a compression gap formed between a compressive surface and a surface of the second wall, flowing the plurality of cells through the microchannel, wherein the flowing comprises: compressing the plurality of cells underneath the one or more compressive surfaces; and exposing the plurality of cells to the at least one cell adhesion entity, wherein the exposing causes a first portion of the plurality of cells, having a first adhesion property, to temporarily bind to the cell adhesion entity, and wherein a second portion of the plurality of cells, having a second adhesion property, follows a trajectory through the microchannel different from a trajectory of the first portion of the plurality of cells follows; compressing the plurality of cells underneath the one or more compressive surfaces; and exposing the plurality of cells to the at least one cell adhesion entity, wherein the exposing causes a first portion of the plurality of cells, having a first adhesion property, to temporarily bind to the cell adhesion entity, and wherein a second portion of the plurality of cells, having a second adhesion property, follows a trajectory through the microchannel different from a trajectory of the first portion of the plurality of cells follows; collecting the first portion of the plurality of cells at the first outlet; and collecting the second portion of the plurality of cells at the second outlet; wherein the compression gap has a height of from 75% to 95% an average diameter of the plurality of cells.